A study focused primarily on building-level leadership by observing how principals in 12 high schools (11 public and 1 Catholic) engaged in planning a structural change from a traditional schedule with 45-minute periods to the 90-minute periods of a block schedule. Using a concerns-based model of change, principals' behaviors and teachers'…

Some school reform programs, such as the "Copernican Plan," advocate long blocks of classroom instruction time to allow greater instructional flexibility and active student participation in classroom work. This study investigated the effectiveness of this strategy by examining the perceptions of high school teachers who were entering or…