OSS-3 is a manual numerical scoring method developed for evidentiary applications. It allows virtually perfect agreement among multiple scorers and it is possible to estimate accuracy from these scores. While the OSS-3 uses far fewer criteria for evaluating data than other systems, it requires scrupulous attention to the scoring protocol to deliver these advantages over traditional 7-position scoring. Not only is this second opinion important, but having an empirical foundation for the analyses that support your conclusion would go a long way toward your credibility in court.
