This study develops the first measurement instrument designed to accompany the concept of competency basing in counselor training. In so doing, the study screens and validates a list of skills most essential to an effective counselor. The problem of this study is to develop and validate an instrument for the measurement of competencies of school counselors. The instrument developed and validated by this study is especially designed to delineate the specific skills which best represent the competencies necessary for a well-qualified counselor.