Referencing a principle from author G.K. Chesterton (to not reform a policy unless you know its original purpose), Wiliam argues that before we make changes to long-established grading practices, we must know the reasons those practices are favored by many teachers, and what benefits the practice may have. He explores why three grading…

The idea that validity should be considered a property of inferences, rather than of assessments, has developed slowly over the past century. In early writings about the validity of educational assessments, validity was defined as a property of an assessment. The most common definition was that an assessment was valid to the extent that it…

Firm evidence shows that formative assessment is an essential ingredient of classroom work and that its development can raise achievement standards. Achieving this goal demands a four-point scheme for teacher development: learning from development, a slow, yet steady dissemination process, reduction of obstacles, and substantive research efforts.…

In most developed countries, the pursuit of reliable and valid means of assessing people's learning generates high volumes of published discourse and, not infrequently, dissent; the documentation on the various assessment policies, practices and theories could conceivably fill whole libraries. Some of the discourse and much of the dissent relate…