48 C.F.R. § 33.201
As used in this subpart-
Accrual of a claim means the date when all events, that fix the alleged liability of either the Government or the contractor and permit assertion of the claim, were known or should have been known. For liability to be fixed, some injury must have occurred. However, monetary damages need not have been incurred.
Alternative dispute resolution (ADR) means any type of procedure or combination of procedures voluntarily used to resolve issues in controversy. These procedures may include, but are not limited to, conciliation, facilitation, mediation, fact-finding, minitrials, arbitration, and use of ombudsmen.
Defective certification means a certificate which alters or otherwise deviates from the language in 33.207(c) or which is not executed by a person authorized to bind the contractor with respect to the claim. Failure to certify shall not be deemed to be a defective certification.
Issue in controversy means a material disagreement between the Government and the contractor that
Misrepresentation of fact means a false statement of substantive fact, or any conduct which leads to the belief of a substantive fact material to proper understanding of the matter in hand, made with intent to deceive or mislead.
48 C.F.R. §33.201