This study assesses the impact of professional development schools (PDSs) on preservice teachers, comparing PDS and non-PDS candidates at the point of licensure. Data sources include student teaching evaluations and portfolio presentations. Statistical analyses reveal PDS candidates scored significantly higher than non-PDS candidates on aspects of planning, instruction, management, and assessment. Qualitative analysis of portfolio presentations reveals PDS candidates showed greater ownership of their school and classroom and more sophistication in applying and integrating Interstate New Teacher Assessment and Support Consortium standards. Five differences are discussed: how and why versus what, standards connected versus standards isolated, assessment as driving instruction versus assessment as tools, reflection connected to practice versus reflection not connected to practice, and student focus versus self-focus. Contextual and programmatic differences are used to explain the differences. The case is made that PDS graduates may affect student learning sooner than traditionally trained beginning teachers.