Dylan Wiliam

British educationalist (Dylan Wiliam, born 1956), Emeritus Professor of Educational Assessment at the UCL Institute of Education in London. Trained originally as a mathematician — taught secondary mathematics in inner-London schools for ten years, then moved into research at King's College London, where he worked from the late 1980s through 2003. Served as Director of the Institute of Education from 2006 to 2010; from 2003 to 2006 was Senior Research Director at the Educational Testing Service (ETS) in Princeton, New Jersey. The work for which he matters in this topic is the long collaboration with Paul Black on formative assessment from the early 1990s onwards, and a subsequent solo career as a public communicator of the assessment-for-learning programme.

Stake§

Wiliam's stake from the late 1990s onwards has combined the academic with the practitioner-facing. He has been the more active of the Black–Wiliam pair on the conference and workshop circuit, and the more visible to UK teachers through the 2000s and 2010s; his solo book Embedded Formative Assessment (Solution Tree, 2011, second edition 2018) is a practitioner-oriented restatement of the Black–Wiliam programme. Like Black, he has continued to argue — in the journals and in public — that summative grading and the formative function pull against each other, and that the policy apparatus that has grown up around assessment-for- learning has often kept the vocabulary and lost the substance.

Wiliam co-authored Inside the Black Box (1998) and the companion technical paper Assessment and Classroom Learning (1998) in Assessment in Education with Paul Black. The technical paper is the academic-apparatus version of the case the booklet made for a non-specialist audience: a review of roughly 250 studies on classroom assessment, reporting effect sizes that the authors argued were among the largest reported for any educational intervention. The work landed at a moment of UK educational policy receptive to standards-raising arguments and unusually willing to act on the assessment-research evidence; the Assessment for Learning programme that followed was the direct policy translation.

The solo work after 2003 has been more practitioner-facing. Embedded Formative Assessment (Solution Tree, 2011) reorganises the Black–Wiliam research synthesis around five strategies a classroom teacher can implement directly — clarifying learning intentions and success criteria; engineering effective classroom discussions; providing feedback that moves learning forward; activating students as instructional resources for one another; activating students as owners of their own learning. The book has sold widely in the teacher-development market, particularly in the United States, and is the source most contemporary US schools meet the formative-assessment programme through.

Wiliam has also been the more public defender of the formative-assessment programme against its dilutions. Several mid-2010s papers — in Educational Assessment, Evaluation and Accountability and elsewhere — argued that assessment for learning, as the phrase has been adopted into US and UK policy, has often been reduced to more frequent low-stakes testing, which is closer to a summative practice in formative clothing than to the gap-closing loop Sadler and the King's group specified. The argument has been cited in the research literature; the policy drift has continued.

He has continued to publish into the 2020s on questions of assessment validity, the limits of teacher-led formative practice, and the relationship between formative assessment and the curriculum knowledge it tries to develop. The empirical programme remains active; the policy reach of the original 1998 work has narrowed somewhat as the assessment-for-learning banner has been absorbed into routine school-improvement vocabulary.