Tiered evidence initiatives are an important federal strategy to incentivize and accelerate the use of rigorous evidence in planning, implementing, and assessing social service investments. The Social Innovation Fund (SIF), a program of the Corporation for National and Community Service, adopted a public-private partnership approach to tiered…

The preceding articles in this issue describe a diverse range of projects which had in common the aim of implementing or improving the practice of formative assessment, and thereby to secure some of the benefits attributed to it. This article attempts to set up a framework within which each of the different studies may be located and…