This study focuses on reasons for the perceived superiority of mission senior high schools in contrast to private and government senior high schools in Liberia, West Africa. Since an effective principal may be equated with an effective school, the study examines background preparation, experience, and professional characteristics of Liberian principals. Findings recommend serious attention to the pre- and inservice training of principals if the most effective leadership is to be provided for Liberia's schools. The study suggests that when adequate preparation programs are offered for principals and when careful selection procedures for new principals are used, the probability for excellence in all schools will be increased. (Author/LD)