This is one form of three performance checks booklets (A, B, and C) for Level I of the Intermediate Science Curriculum Study (ISCS). The three booklets are considered one of four major subdivisions of a set of individualized evaluation materials for Level I of the ISCS. This booklet (form A), developed to assess the students' achievement of the objectives of Level I, contains a set of performance checks equivalent to the performance checks of the other two forms (B and C). Each performance check has its own code number which indicates the unit number and identifies whether it is based on core material or excursions. Directions for students' use of performance checks are also included. (HM)