This study addresses the perceived gap between the vision of education reform in Thailand embodied in its Education Reform Law of 1999 and the results of implementation a decade later. Drawing upon opportunistic data obtained from a sample of 162 Thai school principals, we analyze trends in reform implementation across schools in all regions and levels of Thailand's K-12 education system. The results suggest that a decade following the formal initiation of education reform, changes in teaching and learning, ICT implementation and school management systems have yet to engage the nation's teachers to a substantial degree. The lack of results is linked to a reform strategy that has emphasized top-down implementation and a cultural predisposition to treat change as an event rather than as a long-term process. (Contains 5 tables, 4 figures and 3 notes.)