The assessment for learning framework in education has become big business: huge quantities of time, money and energy have been invested in England, Wales and more recently the USA. This article shows that the assessment for learning theory is inefficient and often contradictory. Black and Wiliam's earlier work provides much of the theoretical…

The literature on validity provides much more guidance on how to collect various kinds of validity evidence than it does on which kinds of evidence to collect in specific cases. An argument-based approach to validation redresses the balance by linking the kinds of evidence needed to validate a test-score interpretation to the details of the…