An evaluation described Tech Prep prototypes as they were implemented in five different Indiana sites and assessed their effectiveness. Evaluation procedures included: (1) collection and analysis of data from students involved in Tech Prep for the first time in 1990-91 and students involved for the second year; (2) analysis of prototype project documentation; (3) on-site observation and interviews; and (4) surveys of local business and industry personnel (72 of 375 responded) and postsecondary educators (78 of 134 responded). Although each was unique in a number of facets, the pilot prototypes at Monroe County Community School Corporation, Metropolitan School District of Wayne Township, Bartholomew Consolidated School Corporation, North Montgomery Community School Corporation, and the School City of Mishawaka had a great deal in common. For the most part, the prototypes were in compliance with state guidelines, incorporated features of the state model, and were working toward development of the levels depicted in the state model. Participation in Tech Prep generally appeared to have a more positive effect on the attitudes of 1990-91 students than on the 1989-90 group. An overwhelming majority of postsecondary educators were aware of, involved with, and supportive of Tech Prep. An overwhelming majority of the business and industry respondents were neither aware of nor involved with the Tech Prep curriculum. Suggestions were made for improving Tech Prep. (A Tech Prep post-graduation tracking system form is appended.) (YLB)