The Comprehensive School Project, the benchmark in the steady trend toward diversification of the Thailand secondary school curriculum, is the focus of this paper. In the first part three stages of educational development are examined and discussed, followed by education in the present period, the 1960 national scheme of education, and the beginnings of diversifications of secondary education. Emphasis is upon examination and tentative evaluation of the major components of the Comprehensive School Project: a five year training program to educate 165 Thailand teachers in Canada in the physical and administrative organization of a comprehensive high school; the sending of advisers to Thailand; consideration of the Thailand project office as an administrative unit; and the outlook for diversification of the secondary school curricula in Thailand. Evaluations indicate that the training program successfully reached its goals, the impact of advisers was excellent, the school project office was highly functional in implementing basic changes, and that as long as diversified secondary education helps the Thai culture survive, the Thai people will incorporate it into their educational system. (SJM)