The contents of voluminous writings, recordings or photographs which cannot conveniently be examined in court may be presented in the form of a chart, summary or calculation. The originals, or duplicates, shall be made available for examination or copying, or both, by other parties at a reasonable time and place. The judge may order that they be produced in court.
Wis. Stat. § 910.06
A chart prepared by the prosecutor during trial, in the jury's presence, to categorize testimony was not a summary under this section, but was a "pedagogical device" admissible within the court's discretion under s. 906.11. State v. Olson, 217 Wis. 2d 730, 579 N.W.2d 802 (Ct. App. 1998), 96-2142.