This guide presents the 1990 update of the National Association for Girls & Women in Sport (NAGWS) interscholastic and collegiate volleyball rules. It includes the official U.S. volleyball rules and a summary of rule changes, definitions of skills and fouls, and a summary of penalties. Officiating techniques and mechanics are covered with a summary of changes in techniques of officiating, mechanics of officiating volleyball, official hand signals, and instructions for use of the official volleyball scoresheet. Other sections of the guide provide a set of study questions, information on NAGWS/ABO services, and the 1990 championship results. (JD)