Reference: Gans, A.; Confrey, T.; Harvey, J.; & Hayes-Roth, B. How WATCH Works: Documentation for the WATCH, NEWWATCH, and METAWATCH Programs. KSL, March, 1990.
Abstract: This paper contains documentation for the WATCH system, which consists of three BB1 application programs. The original WATCH program learns control strategies by generalizing a sequence of actions into a single hierarchical explanation. The NEWWATCH extension allows the action sequence also to contain interruptions in the primary strategy. The MetaWATCH application learns from multiple problem-solving sessions.