How can principal leadership practices promote teacher collaboration and organizational change? A longitudinal multiple case study of three school improvement initiatives

Schools must regularly examine and adapt established practices to address students ' and teachers' changing needs (academic, social, emotional, and occupational; Yet many of the innovations developed to meet these needs fail due to a lack of strategies for implementation (e.g., consistent goal setting), structural prerequisites (e.g., time for planning and implementing innovations), and motivation of school staff (e