This report describes an investigation into how a school moves from a handful of individual teachers dabbling in alternative assessment strategies to full school implementation of an assessment system. The research was conducted at Bay Park Elementary School in the San Diego (California) City School District, a school participating in a pilot project in alternative assessment sponsored by the California Assessment Collaborative. Interviews with eight teachers and the collection of artifacts provided study data. Leadership by the principal, district-wide reform with design tasks and defined expectations for student use, and the state-required quality review of the school coincided to reinforce assessment revision efforts. Parent involvement through site-based leadership helped build community consensus and support for change. Data made it clear that Bay Park has accomplished many of its school-wide assessment goals. Many teachers have become experienced users of alternative assessment tools, and many parents have been included in the decision-making process. The school has an overall vision of where it should go. Recommendations are made for continuing the efforts. Seven appendixes supplement the report and provide the plan for school improvement in San Diego interview protocol, letter to the principal, grade level examples, parent/student reflections and K-12 content standards in reading. (SLD)