The central aspect of Connecticut's agenda for educational equity and excellence is the implementation of statewide mastery testing in mathematics and language arts. The program, designed for grades four, six, and eight, assesses the skill levels of students by measuring their performance on learning objectives they should have mastered in lower grades. Student performance also indicates the effectiveness of remedial assistance programs and regular instruction. This report summarizes the development and implementation of the Grade Four Mastery Test. These four steps in the program are discussed: (1) mastery test development; (2) setting mastery standards by objective; (3) test administration and scoring; and (4) school district test results reporting. Statewide mastery test results are given for Fall 1986. Five charts show the percentage of students who achieved mastery for each test objective. The learning objectives, sample score report, and information about the school districts are presented in 11 appendices. (VM)