The purpose of this paper is to propose a framework for conceptualizing and assessing fidelity of implementation (FOI) in the context of a cluster-randomized design study. A research-validated mathematics curriculum for preschool children called Numbers Plus is used as an example to describe the role of curriculum implementation fidelity in the…

The replication of proven social programs is a cost-effective and efficient way to achieve large-scale, positive social change. Yet there has been little guidance available about how to approach program replication and limited development of systems--at local, state or federal levels--to support replication efforts. "Laying a Solid Foundation:…