Theories and models of washback

This chapter traces the evolution of theoretical models for researching washback in language assessment. It provides an overview of developments in washback studies from initial theory-building to increasingly sophisticated models, reflecting a growing understanding of the complexity of washback and its importance in assessment design and evaluation. It begins with Alderson and Wall’s fundamental question, prompted by growing interest in assessment consequences in the 1980s, ‘does washback exist?’. Early calls to address educational impacts as an aspect of validity came from Frederiksen and Collins, and Morrow. Subsequent models have been developed to guide washback research and by a concern to achieve ‘washback by design’. Wall explored washback through innovation theory, while others built on Hughes’ participants-processes-products framework. Among others, Bailey, Watanabe, Cheng, and Green further elaborated these concepts. More recent work tends to model washback within specific contexts, emphasising its situatedness and complexity. This chapter integrates innovation and motivation theories, evaluates progress, and predicts future directions for washback theory.