Justification of testing practice involves moving from one state of knowledge about the test to another. Theories of test validity can (a) focus on the beginning of the process, (b) focus on the end, or (c) encompass the entire process. Analyses of four case studies test and illustrate three claims: (a) restrictions on validity entail a supplement…

This article considers the design process for new formative history assessments. Over the course of 3 years, my colleagues from the Stanford History Education Group and I designed, piloted, and revised dozens of "History Assessments of Thinking" (HATs). As we created HATs, we sought to gather information about their cognitive validity,…