This article argues that the most effective strategy for achieving school improvement is building the capacity of school personnel to function as professional learning communities, rather than conventional reform methods. It provides evidence that strategic planning in schools in the 1980s was overly complex and difficult to implement, monitor, and assess outcomes. In contrast, focusing on short-term improvement cycles and having teachers collaborate in teams to continuously achieve small wins leads to greater success and engagement over time. When teachers frequently discuss teaching practices and plan, design, and evaluate instruction together, it results in higher quality solutions and remarkable achievement gains.