This work represents a publishing event in education research. Genuinely groundbreaking, it is the result of longitudinal research from five nations over five years. The authors set themselves an unprecedented task: to analyze how it is that successful school principals sustain positive outcomes over a significant period of time. To find out, they initiated the International Successful School Principal Project (ISSPP) assembling 30 multinational case histories and numerous comparative analyses. In doing so, they recorded fresh perspectives on the influence school principals can have on...