MEMORANDUM AND ORDER

          GAUVEY, United States Magistrate Judge.

          BACKGROUND

         United Oil Company, Inc. (" United Oil" ), a distributor of hydraulic oils and industrial chemicals has brought an action in indemnity and contribution to recover the $820,098.89, which it paid to Mr. and Mrs. Jerry Tiede in settlement of their product liability claims against United Oil. Plaintiff sued Rohm & Haas (" R & H" ) as the manufacturer of dyes to which Mr. Tiede was allegedly exposed and sued Parts Associates (" Parts" ) as the distributor of the Fleet-Fill brake cleaner to which Mr. Tiede was allegedly exposed. United Oil's expert, Dr. Kenneth Brown, has opined that certain chemicals in the dyes, specifically xylene and ethyl benzene, and in the brake cleaning fluid, specifically perchloroethylene (a.k.a tetrachloroethylene) caused Mr. Tiede's liver disease.

         Presently pending before the Court are three discovery motions: motion to compel discovery by the United Oil Company, Inc. (Paper No. 31); motion to compel discovery by The United Oil Company, Inc. (Paper No. 42); and Motion to compel discovery by Parts Associates, Inc. (Paper No. 45.) A hearing was held on January 6, 2005. The Court will consider each motion in turn.

         Plaintiff United Oil Company's Motion to Compel R & H to Answer Interrogatories & Requests (Paper Nos. 31, 35 & 39)

         United Oil complains in this discovery motion that R & H has refused to produce four general categories of information, which it seeks to compel. The Court will discuss each category of information in turn.

         - Prior Claims and Lawsuits related to the products and chemical compounds at issue here.

          The theory of the lawsuit against R & H and Parts is a failure to properly warn about the dangers of liver damage, specifically hepatitis, from exposure to R & H's red and blue dyes and Parts' brake cleaner. United Oil asserts that " R & H and Parts Associates' knowledge about these dangers is ... relevant [to the failure to warn]. In addition, information concerning any other claims or lawsuits, whether before or after Mr. Tiede's injuries, is relevant on the issue of causation." (Paper No. 87 at 2.)

          R & H challenges the discoverability of this information based on lack of relevance. To evaluate R & H's challenge, the Court must determine the standard of relevance at the discovery stage and which party carries the burden on the issue of relevance at the discovery stage-the propounding or resisting party. For the reasons set forth below, the Court has determined that United Oil had the obligation to demonstrate threshold relevance of discovery requests to its failure to warn claim under applicable rules and case law, that United Oil successfully made such a showing, and that R & H, as the resisting party, did not demonstrate and support the irrelevance of the discovery requests under governing law.

         Rule 26 governs discovery entitlement and provides that " [p]arties may obtain discovery regarding any matter, not privileged, that is relevant to the claim or defense of any party ...." Fed.R.Civ.P. 26(b)(1). While the Federal Rules of Civil Procedure do not define relevance, the Federal Rules of Evidence do, as " evidence having any tendency to make the existence of any fact that is of consequence to the determination of the action more probable or less probable than it would be without the evidence." Fed.R.Evid. 401. Or, as rephrased in the commentary, " [d]oes the item of evidence tend to prove the matter sought to be proved?"

         Contrary to R & H's suggestion, the 2000 amendments to Rule 26 have not effected any radical change in the availability of discovery in this situation. " The present standard-‘ relevant to the claim or defense of any party’ -is still a very broad one." 8 Wright, Miller & Marcus, Federal Practice and Procedure: Civil 2d § 2008 (Supp.2004). See also Christopher G. Frost, Note, The Sound and the Fury or the Sound of Silence, 37 Ga. L.Rev. 1039, 1067 (Spring 2003). (" All of the reported cases [post 2000 amendments] seem to stand for the proposition, whether expressly or impliedly, that a requesting party need only make a rudimentary showing of relevance by articulating a cogent nexus between a claim or defense and the piece of information sought-a request that appears relevant on its face." )

          Moreover, relevance for discovery purposes is viewed more liberally than relevance for evidentiary purposes. See, e.g., Kidwiler v. Progressive Paloverde Ins. Co., 192 F.R.D. 193, 198 (N.D.W.Va.2000); Hofer v. Mack Trucks, 981 F.2d 377, 380 (8th Cir.1992) (cases cited therein). And, of course, broad discretion is given to the trial court in determining relevance for discovery purposes. Watson v. Lowcountry Red Cross, 974 F.2d 482 (4th Cir.1992).           The commentary to the 2000 amendments to Fed.R.Civ.P. 26 admonishes courts to " focus on the actual claims and defenses involved in the action" in determining relevance. United Oil has brought a failure to warn claim against the defendants. To prove a failure to warn claim, plaintiff must prove, inter alia, that the supplier or manufacturer " knows or has reason to know that the chattel is or is likely to be dangerous for the use for which it is supplied [or manufactured]." Restatement (Second) of Torts §§ 388, 394. And, of course, as in any tort case, plaintiff must prove that the exposure was a proximate cause of Mr. Tiede's injury. See, e.g., Maryland Civil Pattern Jury Instructions § 19:10 (4th ed.2004) (listing cases that deal with proximate cause).

         Courts have allowed plaintiffs to introduce evidence of substantially similar occurrences or lawsuits on the issue of notice and causation. 3 Frumer & Friedman, Products Liability § 18.02[1][b]-[g] (2004); 6 James Wm. Moore, et al., Moore's Federal Practice § 26.41[1][a] (3d ed.2004). (" [O]ther incidents similar to, or involving the same product as, the incident in the lawsuit ... may be relevant to the claims and defenses under certain circumstances.)" Accordingly, there appears to be little dispute that R & H's notice of claims, complaints or lawsuits regarding the dyes, or products " substantially similar" to the dyes would be admissible on the notice and causation elements of the failure to warn claim.

         The question thus becomes whether United Oil is entitled to the discovery it seeks: information on claims, complaints and lawsuits involving R & H products (other than the dyes) containing xylene and ethyl benzene as substantially similar products.

         R & H acknowledges that " some courts have permitted discovery of other litigation where it involves (1) the same or similar claims arising from (2) the same or similar products at issue." (Paper No. 86 at 4). Indeed, that is the widely-accepted view. " [D]iscovery of similar, if not identical, models is routinely permitted in product liability cases." Culligan v. Yamaha Motor Corp., 110 F.R.D. 122, 126 (S.D.N.Y.1986). " [Discovery] of other accidents involving similar products is relevant in products liability cases to show notice to defendants of the danger and cause of the accident." In re Aircrash Disaster Near Roselawn, Ind., Oct., 31.1994, 172 F.R.D. 295, 306 (N.D.Ill.1997). Accord Nachtsheim v. Beech Aircraft Corp., 847 F.2d 1261, 1268 (7th Cir.1988); Gardner v. Q.H.S., 448 F.2d 238, 244 (4th Cir.1971). Moreover, courts have allowed discovery of information regarding the same component part in a different product in a number of product defect cases. See, e.g., Fine v. Facet Aerospace Products Co., 133 F.R.D. 439, 441 (S.D.N.Y.1990) (" Generally, different models of a product will be relevant if they share with the accident-causing model those characteristics pertinent to the legal issues raised in the litigation." ); Schaap v. Executive Industries, Inc., 130 F.R.D. 384, 387 (N.D.Ill.1990) (holding information concerning similar models that have the same component parts to be discoverable); Bowman v. General Motors Corp., 64 F.R.D. 62, 70-71 (E.D.Pa.1974) (allowing discovery of information about subsequent vehicle model with similar fuel system); Uitts v. General Motors Corp., 58 F.R.D. 450, 451 (E.D.Pa.1972) (allowing discovery of all information relating to similar accidents in vehicles manufactured by defendant with a spring identical to the one at issue). However, R & H makes two arguments in resisting the scope of discovery United Oil seeks here.

          First, R & H argues that " the same or similar claims" should be limited to failure to warn claims both involving exposure to the identified dyes and alleging liver damage. The Court agrees in part. The claim here against R & H is for the failure to sufficiently warn as to the dangers of exposure to the dyes as to liver damage. Claims, complaints, and litigation about other dangers and the sufficiency of the product warning as to those dangers are plainly not relevant, as that evidence would not " tend to make the existence of any fact that is of consequence to the determination of the action more probable or less probable than it would be without the evidence." Fed.R.Evid. 401. Obviously, claims involving alleged heart disease as a result of exposure to the dyes would not assist the trier of fact to determine what the manufacturer knew or reasonably should have known about the effect of exposure to the liver. See, e.g., Renfro v. Black, 52 Ohio St.3d 27, 556 N.E.2d 150 (1990)(concluding that where plaintiff suffered paralysis as adverse reaction to a drug, evidence of other adverse reactions to drug was not admissible to show prior knowledge on part of drug manufacturer on issue of duty to warn in products liability suit absent proffer of evidence showing how other reactions were substantially similar to circumstances leading to patient's paraplegia). However, other strict liability or negligence claims against the manufacturer alleging liver damage as a result of exposure to the dyes or their identified liver toxic chemical constituents could constitute a " similar claim" as they could demonstrate defendant R & H's knowledge of risks posed by xylene and ethyl benzene.

          Second, as to the " same or similar products" prong, R & H argues that the mere fact that other R & H products contain xylene or ethyl benzene-in any amount-does not make those products the " same or similar" to the subject dyes for purposes of relevancy and discoverability in this case. (Paper No. 86 at 5).

         Neither R & H's nor the Court's research has revealed any case directly on point. However, review of Rule 26 and the core principles of relevancy and discovery and existing case law suggest that discovery of R & H's knowledge of the dangers of exposure to xylene and ethyl benzene to the liver through claims, complaints, and lawsuits regarding other products containing these chemical compounds is probative of what R & H knew or should have known about the liver toxicity of the dyes at issue here and may also provide admissible evidence on causation.

         Plaintiff's position is that claims, complaints, and lawsuits regarding liver damage from exposure to other products containing xylene and ethyl benzene would demonstrate R & H's notice of the liver toxicity of the dyes at issue here. In theory, that seems correct. Of course, it may well be that the claims, complaints, and lawsuits, if any, will concern products so different in formulation, so different in the quantity of the liver toxic chemical constituents or method of exposure, that the trial judge would exclude the evidence of these claims. Essentially, R & H posits that at this point in the litigation United Oil must prove the substantial similarity of other R & H products, containing, as they logically do, different amounts of the chemical constituents, different formulations, and possibly a different method of exposure. The Court disagrees.

          Generally, the burden is on the party resisting discovery to clarify and explain precisely why its objections are proper given the broad and liberal construction of the federal discovery rules. DIRECTV, Inc. v. Trone, 209 F.R.D. 455, 458 (C.D.Cal.2002); Aircrash Disaster, 172 F.R.D. 295, 307 (N.D.Ill.1997); Obiajulu v. City of Rochester, 166 F.R.D. 293, 295 (W.D.N.Y.1996); Nestle Foods Corp. v. Aetna Cas. and Sur. Co., 135 F.R.D. 101 (D.N.J.1990). This includes, of course, where the resisting party asserts that the discovery is irrelevant. Chavez v. DaimlerChrysler Corp., 206 F.R.D. 615, 619 (S.D.Ind.2002); National Credit Union Admin. v. First Union Capital Markets Corp., 189 F.R.D. 158 (D.Md.1999); Schaap v. Executive Industries, Inc., 130 F.R.D. 384, 386 (N.D.Ill.1990); Spell v. Daniel, 591 F.Supp. 1090, 1114 (E.D.N.C.1984).

          By contrast at the trial, it is the offering party that bears the burden of demonstration of relevance. It is at that juncture that courts require the plaintiff to demonstrate the " substantial similarity" of other accidents, complaints, claims or lawsuits. Drabik v. Stanley-Bostitch, Inc., 997 F.2d 496, 508 (8th Cir.1993) (placing burden on plaintiffs for evidence of other accidents), Cooper v. Firestone Tire & Rubber Co., 945 F.2d 1103, 1105 (9th Cir.1991) (requiring a " showing" of substantial similarity when a plaintiff attempts to introduce evidence of other accidents as direct proof of negligence, a design defect, or notice of a defect.); Buckman v. Bombardier Corp., 893 F.Supp. 547, 552 (E.D.N.C.1995) (placing burden on plaintiff for the introduction of evidence of " substantially similar" accidents).

         Some courts in product liability cases, however, require parties to evince some " threshold showing of relevance" of its discovery request. See e.g., Hofer v. Mack Trucks, 981 F.2d 377, 380 (8th Cir.1992), McCoy v. Whirlpool Corp., 214 F.R.D. 642, 643 (D.Kan.2003) (requiring the requested discovery to " appear[ ] relevant on its face" ); Chavez v. DaimlerChrysler Corp., 206 F.R.D. 615, 619 (S.D.Ind.2002) (the discovery must " appear [ ] relevant" ); Tucker v. Ohtsu Tire & Rubber Co., 191 F.R.D. 495, 497 (D.Md.2000). State Farm Fire and Cas. Co. v. Black & Decker, Inc., 2003 WL 103016, 2003 U.S. Dist. LEXIS 375 (E.D.La.2003); see also Beach v. City of Olathe, 97 F.Supp.2d 1065 (D.Kan.2000) (the discovery must " appear" relevant). When this threshold or apparent relevance is demonstrated, these courts shift the burden to the resisting party to establish the lack of relevance by demonstrating that the requested discovery (1) does not come within the broad scope of relevance as defined under Fed.R.Civ.P. 26(b)(1), or (2) is of such marginal relevance that the potential harm occasioned by discovery would outweigh the ordinary presumption of broad discovery.

          Accordingly, the law does not shift the burden on the question of the relevance from the party resisting discovery to the proponent of the discovery, at least after threshold relevance is demonstrated, as discussed below.

         Nonetheless, R & H attempts to resist the discovery pointing out:

[a]lthough two products may contain one or more of the same constituent chemicals such as xylene and ethyl benzene, the toxicity level of each of the final end products may vary greatly depending on what other chemicals and concentrations are mixed in. Thus, despite United Oil's assertion, it cannot be said that merely because another product contains xylene or ethyl benzene-in any-amount-that product is the " same or similar" to the dyes for the purpose of relevancy and discoverability in this case.

(Paper No. 86 at 5). However, R & H notably does not contest that xylene and ethyl benzene are liver toxicants. (Paper No. 86 Exhs. A, B & D). The Court believes that substantial similarity has been established for discovery purposes by the limitation of the discovery request to other products containing the same admittedly liver toxic chemical constituents in the dyes.

          The Court is not insensitive to R & H's arguments that the manner of application, quantity of the particular chemical component, and indeed the different formula of the product might affect the level of toxicity of the constituent chemical and thus the duty to warn. However, R & H's arguments are lawyerly, though quite effective in raising questions about the similarity of products in terms of relative dangerousness, etc. But, R & H has only raised lawyerly issues and has not provided scientific support for its argument, which in effect is that none of R & H's other (unidentified) products contain xylene or ethyl benzene in the quantity or in a similar formulation to be a comparator to the blue and red dyes at issue here. Courts have been unwilling to limit discovery as to allegedly substantially similar incidents on a defendant's " unverified and factually unsupported claim that the other incidents in which it has been involved are ‘ substantially dissimilar’ from the plaintiff's allegations...." Amcast Indus., Corp. v. Detrex Corp., 138 F.R.D. 115, 120 (N.D.Ind.1991). Of course, R & H is in a far superior position to identify its products during the relevant period that contained the liver toxicants, and to present the testimony of its chemists as to the lack of similarity of other products in terms of liver toxicity. Accordingly, R & H has not demonstrated the irrelevance of the discovery sought or any overarching harm that the discovery would cause, in light of an argued marginal relevance of the information sought.

         The refinement of the issue is for consideration at trial. Ultimately, the trial judge, with the assistance of expert scientific testimony, will determine whether notice as to other products (assuming there are claims, etc. for other products containing the subject chemical components) should be admitted for the jury's consideration on whether R & H had notice of the liver toxicity of xylene and ethyl benzene in the subject dyes by claims of liver damage due to exposure to other products containing the same chemical components (which are indisputably toxic to the liver) and whether other incidents involving the same chemical constituents demonstrate causation here.

         United Oil is entitled to discovery of those products containing the same injury-causing chemical compounds exposure to which United Oil asserts resulted in Mr. Tiede's liver damage. See Fine v. Facet Aerospace Prod. Co., 133 F.R.D. 439, 441 (S.D.N.Y.1990) (" Generally, different models of a product will be relevant if they share with the accident-causing model those characteristics pertinent to the legal issues raised in the litigation." )

         If discovery reveals that R & H received claims, complaints, and lawsuits complaining of liver damage involving other products containing the subject chemical compounds, it will be the plaintiff's responsibility to show that notice as to the dangerous properties of those products-with different amounts of xylene and/or ethyl benzene and in different formulation-should have put R & H on notice of the dangerous properties of the red and blue dyes and of the insufficiency of the existing warning. To decide that issue now-without knowledge of how similar the amounts, formulation, etc. of the other products and without scientific input and context-would be premature and possibly deprive plaintiff of discovery which might demonstrate notice and causation in similar exposure situations.

          Of course, there are other grounds, such as burdensomeness, upon which a party can resist even relevant discovery. While R & H has complained generally about the burdensomeness of such a discovery request (Paper No. 86, 8), R & H has not demonstrated that burden with the requisite specificity and formal affidavit. See Tucker v. Ohtsu Tire and Rubber Co., 191 F.R.D. 495, 498 (D.Md.2000); Oleson v. Kmart Corp., 175 F.R.D. 560, 565 (D.Kan.1997).

          Accordingly, the Court grants the motion to compel answers to interrogatory nos. 15 (as modified in the June 2, 2004, meet and confer conference) and 16 (limited to the last 10 years) and requests for production nos. 20 (limited to the last 10 years) and 27(limited to the last 10 years). Unless the parties have agreed otherwise, the ten years shall be measured backwards from the date of the discovery request.

          Information about claims, complaints, and lawsuits about other substantially similar products post-incident may be relevant as to causation and would be admissible for causation only. " While an accident occurring after the one under investigation might not have been relevant to show defendant's prior knowledge or notice of a product defect, it may have been highly relevant to causation...." Dollar v. Long Mfg., 561 F.2d 613, 617 (5th Cir.1977). Post-accident discovery is allowed because " [w]hile only earlier accidents can be relevant to the issue of notice, causation is an issue affected only by the circumstances and the equipment, and is not related to the date of the occurrence." Uitts v. Gen'l Motors Corp., 58 F.R.D. 450, 452 (E.D.Pa.1972). Accordingly, United Oil is entitled to post-incident discovery, which the definition of the 10-year period permits.

         As to request for production no. 22, it is too broad as drafted, and the request should be limited to defined categories of documents and to a 10 year period. However, within 10 business days of this Memorandum and Order, United Oil may pose a request for defined categories of documents.

         As to request no. 23, it is too broad as drafted, and the request should be limited to the chemicals at issue and to defined categories of documents and for a 10 year period. Again, within 10 business days of this Memorandum and Order, United Oil may pose a request for defined categories of documents.

         Of course, in conformance with local rules, a privilege log should be produced, if privilege is asserted, as it was in R & H's answer to interrogatory no. 15 and request nos. 22 and 23.

         - Persons with Knowledge

          As to the interrogatory no. 9 and request no. 17 seeking the identification of persons with knowledge, the Court agrees with R & H that this interrogatory and request are too broad and appear to seek work-product in terms of requiring the responding counsel to decide what information " tends to support" a particular legal position. However, within 10 business days of this Memorandum and Order (and if United Oil has not received the information as a result of R & H corporate designee's deposition), United Oil may pose a more tailored interrogatory and request as to specific areas of knowledge. R & H shall answer by identifying specific employees or consultants, their titles and departments, and the subject matter of their knowledge. The Court agrees with United Oil that R & H clearly employs persons with knowledge of toxicity of the subject chemicals and whom (should be identified) once properly tailored interrogatories are propounded.

          Similarly, as formulated, the Court agrees with R & H that interrogatory no. 12 violates the work-product doctrine. However, within 10 business days of this Memorandum and Order, United Oil may pose a proper interrogatory asking for the custodian of substantive categories of relevant documents-not all documents that defendant R & H believes supports its positions, without greater specificity.

         In response to these discovery requests, R & H asserts certain privileges and must provide a privilege log as to specifically withheld documents.

         - Discovery Regarding Denials and Affirmative Defenses

         The Court grants the motion to compel as to interrogatory no. 3 (the answer to which appears non-responsive), interrogatory no. 4, and request no. 4. R & H should clarify if it is claiming that Material Safety Data Sheets are the only responsive documents; otherwise, R & H should produce other responsive documents and schedule on a privilege log any documents withheld on that basis.

         The Court also grants the motion to compel as to the listed " contention" interrogatories 5, 6, 7, and 8, and responses are due within 10 business days of this Memorandum and Order.

          The Court denies the motion to compel as to request for production no. 3 as too broad.

         The Court grants the motion as to request for production no. 7 insofar as it tracks the substance of the R & H answer to interrogatory no. 8, request no. 8 as to documents showing the negligence of United Oil, if any, and request no. 9.

         - Documents regarding regulatory framework

          The Court denies the motion to compel as to interrogatory 17 and request for production no. 24 as too broad and non-specific.          R & H shall provide all ordered discovery responses within 15 business days of the date of this Memorandum and Order.

         Plaintiff United Oil's Motion to Compel Parts Associates (Paper Nos. 42, 48 and 51)

         In its motion to compel, United Oil complains about Parts' refusal to produce four categories of documents: (1) information concerning substances other than those identified in United Oil's complaint; (2) information that post-dates the filing date of the underlying Tiede action (December 2000); (3) prior claims and lawsuits related to the chemicals at issue in the case; and (4) documents and persons who will support Parts' denials and affirmative defenses as stated in its Answer and other responsive pleadings. The Court will discuss each category in turn.

         - Information concerning substances other than those identified in United Oil's complaint

          Parts argues that United Oil has no entitlement to discovery about products or chemical constituents not mentioned in the complaint. The Court disagrees. The fact that the complaint does not specifically identify the toxic chemical constituents in the Fleet Fill brake cleaner, does not, in the Court's opinion necessarily preclude discovery as to those toxic chemical constituents. The focus of the 2000 amendments to Rule 26 on the specific claim or defense alleged in the pleadings " does not mean that a fact must be alleged in a pleading for a party to be entitled to discovery of information concerning that fact." 6 James Wm. Moore, et al., Moore's Federal Practice § 26.41[2][a] (3d ed.2004). On the other hand, that does not mean, of course, that discovery is limitless. United Oil has alleged that exposure to Fleet Fill brake cleaner was a cause of the liver disease of Mr. Tiede and that United Oil is entitled discovery of the Parts' knowledge of the liver toxicity of the products it distributed. There is no apparent disagreement that Fleet Fill contains perchloroethylene, that it is a liver toxicant, and that perchloroethylene is also known as tetrachloroethylene. (Paper No. 42 at 12; Paper No. 48, Exh. 1). The complaint identifies both perchloroethylene and trichloroethane as the injury-causing constituents of Fleet Fill. (Paper No. 1 at ¶ ¶ 10, 23, 24). The 1990 MSDS for Fleet Fill Brake Cleaner also lists trichloroethane as a " hazardous component." (Paper No. 51 Exh. 3). While the MSDS also states that the health hazards of the product include liver damage under certain circumstances, it is unclear which component poses that risk. Neither Dr. Brown's report nor any of the briefing papers or oral argument indicate that this ingredient is a liver toxicant. Until plaintiff provides some evidence of threshold relevance or the parties otherwise agree, Parts is not required to provide discovery responses specifically as to trichloroethane.

         The complaint does not reference methyl chloride. Neither of the MSDSs in Parts' possession show Fleet Filler to contain methyl chloride. Based on counsel's representations at the hearing, the Court finds that Parts has made reasonable efforts to obtain any additional MSDSs from the now defunct manufacturer of the Fleet Fill brake cleaner. United Oil has no evidence that Fleet Fill specifically (as opposed to brake cleaners in general) contained methyl chloride. Accordingly, Parts is not required to answer any discovery requests as to methyl chloride.

         - Prior claims and lawsuits related to the chemicals at issue in the case

         Parts resists providing discovery of other products it distributes containing the same toxic chemicals contained in Fleet Fill brake cleaner. Parts asserts such information is not relevant to any claim and further asserts that United Oil has not demonstrated the " good cause" necessary for subject matter discovery. (Paper No. 48 at 5).           For the same reasons set out above in the ruling on United Oil's motion against R & H, the Court believes that discovery of " substantially similar" products is relevant to the claim of failure to warn and thus not subject to proof of good cause before discovery entitlement. At this discovery phase, the Court finds that the presence of the same toxic chemical constituent in other products establishes threshold relevance for discovery purposes regarding those other products' information.

          Parts also challenges the discoverability of information on claims and lawsuits either before or after Mr. Tiede's employment at Johnson Control. As discussed supra, the Court rejects the argument that discovery should be limited solely to the Fleet Fill brake cleaner and solely during the period of Mr. Tiede's employment. Courts admit evidence of notice derived from earlier claims and lawsuits of the same or similar products for purposes of establishing notice and causation in a failure to warn case. The relevant time period is not defined by Mr. Tiede's period of employment nor are the relevant products only those distributed to Johnson Control. As in the case of R & H, Parts is ordered to produce information about all claims and lawsuits that involved products it distributed containing perchloroethylene (tetrachloroethylene) and alleged to cause liver damage for ten years (dated back from the date of the original discovery requests).

         - Information which post-dates the date the underlying Tiede action was filed

         Parts argues that no good cause has been demonstrated for information post-dating the Tiede complaint. (Paper No. 48 at 7). As stated supra, United Oil does not have a good cause burden for discovery related to its claim and courts have found that post-incident data can be relevant to causation.

         Accordingly, as to these first three categories of information, the Court grants the motion to compel.

         - Interrogatory no. 15 -The defendant need only have answered this interrogatory as to Fleet-Fill Brake Cleaner and its constituents. For the reasons discussed supra, United Oil is certainly entitled to information of proceedings or lawsuits alleging personal injury of the type alleged here-liver damage-regarding the Fleet Fill brake cleaner and proceedings or lawsuits involving the toxic constituents of Fleet Fill. Moreover, because post-Tiede information may be relevant to causation, Parts should have answered through the date of its answer to this discovery request. In its supplemental response, it appears to have done so notwithstanding its objections, but if not, Parts Associates shall do so. However, given assertion of privilege, defendant should either attach a privilege log or confirm that there are no responsive privileged documents.

         - Request no. 14 -(only related to any policies dealing with the sale of Fleet Fill and its hazardous properties).

         - Request no. 4 -(only related to hazardous nature of product).

         - Request no. 6 -(only related to hazardous nature of product).

          - Request no. 13 -Parts need only answer as to documents relating to the hazardous nature Fleet-Fill Brake Cleaner and its constituents, which it appears to have done. However, because Parts' original response asserted attorney-client, work-product, or other privilege, Parts should provide a privilege log or confirm that no responsive, privileged documents were withheld.

         - Request nos. 20, 21, 22, 23, 27 -(only related to hazardous nature of product or constituent, same limits as to interrogatory no. 15 apply).

         - Documents and persons who will support denials and affirmative defenses

         Parts should answer interrogatories 5, 7, and 17, and requests for production 7, 8, and 9.

          Parts need not further answer interrogatory no. 6, which is overbroad and demands proof of a negative, interrogatory no. 11, which is overbroad and seeks work product, and requests for production 2 and 3, which are overbroad.

         - Documents regarding regulatory framework

         The Court denies the motion to compel an answer to request for production no. 24.

          The Court grants the motion as to interrogatory nos. 3 and 4 and request nos. 4 and 6, but limits Parts' required response to information related only to the hazardous nature of the product or its constituent and its distribution or sale.

         Parts is not required to answer any of the interrogatories or requests not mentioned above, as they were overbroad or not relevant, especially in light of burdensomeness, including but not limited to interrogatory no. 16 and requests for production 16 and 24.

         Parts shall provide all ordered discovery responses within 15 business days of the date of this Memorandum and Order.

         Defendant Parts Associates, Inc.'s Motion to Compel (Paper Nos. 45, 49 and 50)

          The Court grants in part and denies in part the defendant's motion, as set forth below. As a general matter, the Court agrees with Parts that the plaintiff's answers to interrogatories through reference to certain boxes of files of documents is inadequate under Rule 33. Production of documents under Rule 33(d) is inappropriate where, as here, the burden of ascertaining the answer is not the same for defendant as for plaintiff. Rule 33 production is suited to those discovery requests requiring compilation or analysis, accomplished as easily by one party as another, or where neither side has clear superiority of knowledge or familiarity with the documents. Accordingly, Rule 33 is well-suited to reply to inquiries of an intensely objective nature.

         Here, however, the interrogatories pose questions of fact or mixed questions of law and fact which require the exercise of particular knowledge and judgment on the part of the responding party. Moreover, United Oil as a defendant in the Tiede suit obviously has superior familiarity with the documents at issue.

          Here defendant Parts has said that even after review of the referenced documents, it still cannot derive the answer to its specific questions. Accordingly, even if the Court accepted the burden of ascertainment as the same between the parties (which the Court does not), or determined that Parts' law firm had the resources to do the necessary review (which the Court does not), the documents do not provide any certain or clear answers to the interrogatories. This Court agrees that " [d]efendants are entitled to know the factual content of plaintiff's claims with a reasonable degree of precision." Martin v. Easton Publishing Co., 85 F.R.D. 312, 315 (E.D.Pa.1980). Thus, as to interrogatory nos. 8, 9, 10, 11, 12, 15 and 16, plaintiff should answer completely and specifically rather than by reference to documents.

          As to interrogatory no. 13, the Court agrees that this interrogatory is impermissibly overbroad, and if answered would produce much tangential if not irrelevant information. Accordingly, the Court denies the motion to compel as to interrogatory no. 13. Parts may pose a reasonably limited number of follow-up interrogatories as to specific persons and specific facts within 10 business days of receipt of the above ordered answers.

          As to interrogatory no. 18, the Court agrees that the date that United Oil first identified the conduct of Parts as a proximate cause or a contributing factor is questionably relevant and approaches inquiry into work product so the Court denies the motion to compel. However, the defendant is entitled to know the factual basis for plaintiff's contention that Parts' conduct was a proximate cause or a contributing factor, without reference to documents.

         As to the request for documents, the Court grants the motion to compel as to request no. 9, as the initial objection asserted a work product privilege and the response referred to the availability of " non-privileged" responsive documents, but no privilege log was provided. The plaintiff should provide a privilege log or state affirmatively that no responsive documents were withheld based on privilege.

         The Court denies the motion to compel as to request no. 21, finding the response to that request sufficient at this point in the litigation.

         United Oil shall provide all ordered discovery within 15 business days of the date of this Memorandum and Order.

         Accordingly, the Court hereby grants in part and denies in part the motion to compel discovery by the United Oil Company, Inc. (Paper No. 31); motion to compel discovery by the United Oil Company, Inc. (Paper No. 42); and motion to compel discovery by Parts Associates, Inc. (Paper No. 45).

         Future Schedule

          The order of referral from Judge Quarles included scheduling revisions associated with these discovery motions. Accordingly, the fact discovery deadline in this case shall be 90 days from the date of this Memorandum and Order.

The commentary rejects the bright line urged by the parties here, to allow only discovery as to the specific incident and specific product as a matter of right, with all other discovery requiring demonstration of good cause.

Rather the commentary states:

A variety of types of information not directly pertinent to the incident in suit could be relevant to the claims or defenses raised in a given action. For example, other incidents of the same type, or involving the same product, could be properly discoverable under the revised standard.

Interrogatory No. 16: " Identify each and every license or certificate that you have obtained in the past 10 years, and if such license pr [sic] certificate has ever been suspended or revoked, or your renewal has ever been refused or delayed, set forth all the facts surrounding such suspension, revocation, refusal, or delay, including, but not limited to, the date of such suspension, revocation, refusal, or delay, and the reason(s) thereof."

Request for production No. 20: " All deposition and trial transcripts related to any other claims or lawsuits based in whole or in part on alleged hazards of Permatex or Fleet-Fill Brake Cleaner, perchloroethylene, tetrachloroethylene, trichloroethane, or methylene chloride."

Request for production No. 27: " Produce copies of all workers compensation claims filed by defendant employees related to exposure to Permatex or Fleet-Fill Brake Cleaner, perchloroethylene, tetrachloroethylene, trichloroethane, or methylene chloride."

As mentioned previously, R & H need not provide responses with respect to CI Solvent Blue 98 or CI Solvent Red 98. See supra note 2.

Interrogatory No. 4: " Identify all documents that you were required by law and/or regulation to provide to persons and/or organizations to whom you sold Automate Blue 8, Anthraquinone dye, C.I. Solvent Blue 98, Automate Red B, Disazo dye, C.I. Solvent Red 164, Xylene, or Ethyl benzene from 1/94 through 10/98."

Request for production No. 4: " All documents that you were required by law to prepare and maintain for the manufacture and sale of Automate Blue 8, Anthraquinone dye, C.I. Solvent Blue 98, Automate Red B, Disazo dye, C.I. Solvent Red 164, Xylene, or Ethyl benzene from 1/94 through 10/98."

Interrogatory No. 6: " Is Automate Red B, Disazo dye, C.I. Solvent Red 164, Xylene, and Ethyl benzene safe for unprotected human exposure under all circumstances? If not, why?"

Interrogatory No. 7: " If you contend that you did not cause or contribute to the injuries and damages that are alleged in the Complaint, state in detail the entire basis for such contention."

Interrogatory No. 8: " If you contend that any person(s) other than you caused or contributed to any of the alleged occurrences described in the Complaint, identify the other person(s) and state each and every fact upon which you rely in support of your contention."

Request for production No. 8: " If you contend or have information tending to show that the Plaintiff(s) was/were guilty of any negligence causally contributing to the injuries and damages claimed by the Plaintiff(s), provide all documents that relate or refer to such contention and/or information."

Request for production No. 9: " If you contend or have any information tending to show that the injuries and damages claims by the underlying Plaintiff Mr. Tiede were due to any cause other than the occurrence, provide all documents that relate or refer to such contention and/or information."

Request for production No. 24: " All licenses or certificates to sell products for the past five years."

Request for production No. 21: " All deposition and trial transcripts of any person named as an expert by the Plaintiff(s)."

Request for production No. 22: " All documents that relate or refer to every claim that has ever been filed against you (whether or not the claim resulted in the filing of a lawsuit) for alleged personal injuries related to Permatex or Fleet-Fill Brake Cleaner, perchloroethylene, tetrachloroethylene, trichloroethane, or methylene chloride."

Request for production No. 23: " All documents that relate to any administrative, civil, or criminal proceedings or lawsuit arising out of or resulting from the sale of products, including, but certainly not limited to all pleadings, discovery responses, and deposition transcripts in every claim that has ever been filed against you (that resulting [sic] in the filing of a lawsuit) for personal injuries."

Request for production No. 27: " Produce copies of all workers compensation claims filed by defendant employees related to exposure to Permatex or Fleet-Fill Brake Cleaner, perchloroethylene, tetrachloroethylene, trichloroethane, or methylene chloride."

Interrogatory No. 7: " If you contend that any person(s) other than you caused or contributed to any of the alleged occurrences described in the Complaint, identify the other person(s) and state each and every fact which you rely [on] in support of your contention."

Interrogatory No. 17: " State all facts upon which you rely in support of each defense in your Answer or Complaint."

Request for production No. 7: " If you contend or have information tending to show that any person(s) other than you allegedly caused or contributed to any of the injuries and damages that are alleged in the Complaint and Demand for Jury Trial, provide all documents that relate or refer to such contention and/or information."

Request for production No. 8: " If you contend or have information tending to show that the Plaintiff(s) was/were guilty of any negligence causally contributing to the injuries and damages claimed by the Plaintiff(s), provide all documents that relate or refer to such contention and/or information."

Request for production No. 9: " If you contend or have any information tending to show that the injuries or damages claimed by the underlying Plaintiff Mr. Tiede were due to any cause other than the occurrence, provide all documents that relate or refer to such contention and/or information."

Interrogatory No. 11: " If you intend to rely upon any documents or other tangible things to support a position that you have taken or intend to take in the action, including any claim for damages, provide a brief description, by category and location, of all such documents and other tangible things, and identify all persons having possession, custody, or control of them."

Request for production No. 2: " All documents relied upon in answering the interrogatories propounded to you."

Request for production No. 3: " All documents that relate or refer to the allegations in this case."

Interrogatory No. 4: " Identify all documents that you were required by law and/or regulation to provide to persons and/or organizations to whom you sold Permatex or Fleet-Fill Brake Cleaner, perchloroethylene, tetrachloroethylene, trichloroethane, or methylene chloride from 1/94 through 10/98."

See supra notes 21 and 22 for text of requests for production nos. 4 and 6.

Interrogatory No. 9: " State each fact on which United Oil bases all allegations in paragraph 14; identify all documents you rely on in support of your answer to this interrogatory and each and every person who has knowledge of the facts set forth in your answer to this interrogatory. For each such person identified, state the nature or substance of his or her knowledge, and the basis of his or her knowledge."

Interrogatory No. 10: " State each fact on which United Oil bases the allegation in paragraph 20 of the Complaint in this action that ‘ any and all liability, joint and several, that could be found against United Oil for proximately causing any injury to the Tiedes is directly attributable to the active and primary acts and/or omissions of Parts; ’ identify all documents you rely on in support of your answer to this interrogatory and each and every person who has knowledge of the facts set forth in your answer to this interrogatory. For each such person identified, state the nature or substance of his or her knowledge, and the basis of his or her knowledge."

Interrogatory No. 11: " State each fact on which United Oil bases the allegation in paragraph 21 of the Complaint in this action that ‘ Fleet-Fill Brake Cleaner, which is designed, manufactured, and/or sold by Parts and contains the chemicals Trichloroethane and Perchloroethylene, is a direct and proximate cause of the Tiedes' injuries; ’ identify all documents you rely on in support of your answer to this interrogatory and each and every person who has knowledge of the facts set forth in your answer to this interrogatory. For each such person identified, state the nature or substance of his or her knowledge, and the basis of his or her knowledge."

Interrogatory No. 12: " State each fact on which United Oil bases the allegation in paragraph 36 of the Complaint in this action that ‘ [t]he active and primary culpable conduct of Parts proximately caused and/or contributed to the injuries suffered by the Tiedes; ’ identify all documents you rely on in support of your answer to this interrogatory and each and every person who has knowledge of the facts set forth in your answer to this interrogatory. For each such person identified, state the nature or substance of his or her knowledge, and the basis of his or her knowledge."

Interrogatory No. 15: " Identify all individuals not otherwise identified above who have knowledge of any and all facts that form the basis for any and all allegations set forth in the Complaint; and for each such person identified, state the nature or substance of his or her knowledge, and the basis for his or her knowledge."

Interrogatory No. 16: " Identify any and all witnesses, including fact and expert witnesses, who testified, opined, or stated in the Tiede Action that Fleet-Fill Brake Cleaner was the cause of Mr. Tiede's injuries; for each such witness identified provide the page and line deposition citation(s), expert witness disclosure(s) or report(s), and/or any written statement(s) in which they so testified, opined, or stated."