A study was conducted to determine the diffusion of educational innovations to urban and rural government secondary schools of Thailand and to teachers within these schools. Data were acquired by selecting 38 schools at random and having 629 teachers, 38 principals, and 66 changwad (provincial) education officers complete questionnaires. Some of the major findings were: (1) younger teachers tended to become aware of innovations first: (2) teachers with high exposure to mass media tended to adopt innovations earlier; (3) women teachers were more likely to view innovations as beneficial; (4) principals who had traveled abroad usually became aware of innovations earlier; (5) schools with principals who were older men and had traveled abroad tended to adopt innovations before other schools; (6) principals who saw themselves psychologically close to their faculty viewed innovations as beneficial; (7) better educated changwad officers were likely to become aware of innovations earlier; (8) the earlier the schools in changwads adopted innovations, the more likely their officers were to have traveled abroad and have had more experience; and (9) changwad officers who viewed innovations as beneficial were usually older and had had experience as secondary school teachers. (RH)