The purpose of this study was to develop a valid and reliable assessment instrument. This instrument is to be used by school administrators to assess the organizational structure and administrative effectiveness of state high school interscholastic activities associations. This study proceeded through four phases. The first phase was for developing criteria items and included a review of the literature. The second phase was for the purpose of item validation and consisted of submitting a questionnaire to an advisory panel of five persons. The third phase of the study was for the purpose of validation by content validity. The questionnaire was submitted to a randomly selected group of state interscholastic activities associations' directors and presidents of the state superintendents associations and the state high school principals associations. In the fourth phase of the study the reliability of the instrument was established through a questionnaire survey using a similar population as the validity survey.