Table of Contents
Type: Literature Review | Subject: Education | Level: Masters | Word Count: ~3,900 words
This model Literature Review was produced by an Essays UK specialist as reference material for learning purposes only. For support in this field, see our Education writing specialists.
Overview: This literature review examines how formative assessment is understood and enacted in UK secondary schools and what the evidence says about its contribution to pupil attainment. It synthesises the seminal “assessment for learning” scholarship with the domestic policy trajectory from the Assessment Reform Group to the post-levels landscape, and appraises the frequently contested claims made for its impact.
The question of how teachers can use assessment not merely to measure learning but to improve it has been one of the most durable concerns of English education policy and practice over the past quarter of a century. Formative assessment — the use of evidence about pupil understanding to adapt teaching and to help learners close the gap between where they are and where they need to be — moved from the margins of classroom research to the centre of national policy following the influential reviews of the late 1990s. For postgraduate students of education the concept raises a deceptively simple question that this review addresses: to what extent, and under what conditions, does formative assessment actually raise attainment in UK secondary schools?
The term itself is contested, and the review returns to that contest throughout. “Formative assessment” is frequently used interchangeably with “assessment for learning” (AfL), yet the two are not synonymous, and the slippage between them has consequences both for how the practice is researched and for how it is implemented. In the English context the concept acquired particular political force after Black and Wiliam’s (1998) synthesis of the international research, which the Assessment Reform Group (2002) distilled into a set of principles that shaped a decade of national strategy. The subsequent reforms — the removal of National Curriculum levels in 2014, the Commission on Assessment without Levels (Department for Education, 2015), and the move to the reformed 9–1 GCSE — have repeatedly invoked formative assessment while leaving unresolved the question of what counts as credible evidence of its effectiveness.
The secondary phase deserves particular attention because the conditions that shape formative practice there differ markedly from the primary setting in which much of the influential evidence was generated. Secondary teaching is organised by subject specialism, lesson contact with any given class is intermittent, and the proximity of high-stakes external examinations exerts a strong backwash on what teachers choose to assess and reward. A mechanism that works in a primary literacy lesson may therefore behave quite differently in a Key Stage 4 chemistry or history classroom, and this phase-specific caveat runs through the discussion that follows.
This review pursues three aims. First, it clarifies how formative assessment has been conceptualised across the seminal and more recent literature. Second, it synthesises the empirical evidence on the mechanisms through which formative assessment is claimed to raise attainment, with particular attention to feedback and to classroom enactment in secondary settings. Third, it critically appraises the strength of the evidence base, situating the often-cited effect sizes within the methodological debates that have accompanied them. The review is organised around four themes that emerged from the reading — the conceptualisation of the construct, feedback, classroom implementation, and the contested evidence on attainment — before appraising the body of work as a whole and identifying a research gap specific to the contemporary UK secondary context.
Because formative assessment spans several decades and multiple research traditions, a structured search was undertaken to ensure that the review captured both the foundational texts and more recent critical scholarship. The search combined a systematic element — Boolean searching of major education databases — with a measure of purposive snowballing, since several of the most influential sources are books and policy reports rather than indexed journal articles. The strategy is summarised in Table 1.
| Source / database | Example search string | Records identified | Retained after screening |
|---|---|---|---|
| British Education Index | “formative assessment” AND (“secondary” OR “attainment”) | 142 | 11 |
| ERIC | (“assessment for learning” OR “formative assessment”) AND feedback | 318 | 9 |
| Scopus | “formative assessment” AND “pupil attainment” | 76 | 6 |
| Google Scholar (first 100) | “assessment for learning” UK secondary | 100 | 7 |
| Grey literature (DfE, EEF, Ofsted, ARG) | hand-searched policy and guidance reports | 24 | 5 |
Table 1. Search strategy, sources and screening. Counts are illustrative of the screening process rather than an exhaustive bibliometric audit.
Searches were restricted to English-language sources published between 1988 and 2022, with 1988 chosen as the lower bound because Butler’s work on feedback and motivation predates and informs the AfL literature. Inclusion and exclusion were governed by the following criteria:
Retained sources were appraised for the fit between their research questions and design, the transparency of their methods, and the relevance of their context to UK secondary schooling. No single formal quality-scoring instrument was imposed, because the corpus deliberately mixed meta-analyses, small-scale observational studies, and policy documents that are not amenable to a common appraisal checklist. This pragmatic approach is a recognised limitation of a narrative synthesis of this kind and is revisited in the critical appraisal below. After de-duplication and the screening of titles and abstracts, a core corpus of foundational reviews, empirical studies, meta-analyses, and policy documents was retained for full synthesis.
The most widely cited definition in the field is the broad one offered by Black and Wiliam (1998), who treat formative assessment as encompassing any activity undertaken by teachers or by pupils themselves that generates information used as feedback to modify the teaching and learning in which they are engaged. The emphasis falls deliberately on the use of the information rather than on its collection, and this functional emphasis is important: the same test can serve a summative or a formative purpose depending on whether, and how, its results feed forward into subsequent learning. The distinction between formative and summative assessment is therefore one of function, not of instrument.
The Assessment Reform Group (2002) reframed this body of work for English practitioners under the banner of “assessment for learning”, setting out ten principles that positioned it as part of effective planning, as central to classroom practice, as sensitive to how pupils learn, and as a means of fostering motivation and the capacity for self-assessment. Wiliam (2011) subsequently tightened the definition around the idea that assessment functions formatively when evidence of achievement is elicited, interpreted, and used by teachers, learners, or peers to make better-founded decisions about next steps than they would otherwise have made. This formulation usefully locates the construct in a decision rather than in a technique.
Against this, Bennett (2011) warns that the term has become so elastic as to risk incoherence, stretching from a two-minute mid-lesson question to a commercial interim testing system, and he argues that this definitional breadth undermines any confident claim about “its” effectiveness because the studies gathered under the label are not measuring the same thing. The instability matters acutely for a review concerned with attainment, since effect sizes aggregated across such heterogeneous practices may be close to meaningless. Torrance (2007) adds a further caution: an over-proceduralised version of AfL can tip into what he terms “assessment as learning”, in which the apparatus of explicit objectives, criteria, and feedback comes to dominate and narrow what is learned, so that pupils pursue the criteria rather than the understanding the criteria were meant to represent. Conceptualisation is thus not a preliminary tidying exercise but a substantive fault line running through the whole field.
If one mechanism recurs across the literature as the putative engine of formative assessment, it is feedback. Hattie and Timperley (2007) model effective feedback as answering three questions and operating at the levels of task, process, and self-regulation, while arguing that feedback directed at the self in the form of praise is among the least effective:
Hattie’s (2009) later synthesis placed feedback among the higher-impact influences on achievement, though he was explicit that the variability of feedback effects is as striking as their average magnitude, and that poorly conceived feedback can depress performance. The classic empirical anchor is Butler (1988), whose experimental study found that pupils given comments alone subsequently outperformed those given marks, or marks accompanied by comments, apparently because the presence of a grade redirected attention towards ego-involving social comparison and away from the task itself. Black et al. (2003), reporting on a substantial English classroom-development project, translated this into the practical recommendation that secondary teachers move towards comment-only marking, a prescription that was widely, and sometimes uncritically, adopted across English schools.
Yet the mechanism is more fragile than its popularity implies. Feedback functions formatively only if pupils understand it, accept it, and are given the time and the structures to act on it; where any of these conditions fails, even technically excellent feedback produces no learning. The Education Endowment Foundation’s (2021) guidance review reflects this maturation of the field, concluding that feedback can be highly cost-effective but that its impact is contingent on timing, on the learner’s response, and on teacher workload being kept proportionate, since elaborate written marking policies can consume disproportionate effort for uncertain return. This theme therefore complicates any simple equation of “more feedback” with “higher attainment”, and points towards the quality of the feedback loop rather than its volume.
The translation of formative assessment principles into secondary classrooms reveals a persistent gap between the “letter” and the “spirit” of the practice. Marshall and Drummond (2006), observing English secondary lessons, distinguished teachers who enacted the underlying principle of promoting pupil autonomy from those who adopted only the visible procedures — the traffic-light cards, the objectives copied onto the board, the randomised questioning — without the intent those procedures were meant to serve; they found the former comparatively rare. This distinction has become one of the most important findings in the UK literature, because it implies that the surface adoption of AfL techniques, which national strategies actively promoted, can proceed without the deeper change in classroom discourse that the underlying theory requires.
A cluster of techniques recurs across the practice literature: rich, open questioning with extended wait time; the sharing and co-construction of success criteria; structured peer and self-assessment; and whole-class responsive techniques that make pupil thinking visible so that teaching can adapt in the moment (Wiliam, 2011). Each, however, makes demands on teacher subject knowledge and pedagogical skill that are unevenly distributed across departments and schools, and each is more cognitively demanding to enact well than to perform superficially. The improvement of questioning in particular depends on a teacher’s capacity to anticipate likely misconceptions in their subject, which is itself a function of experience and professional learning rather than of technique alone.
The policy history compounds the difficulty. The national assessment infrastructure of the 2000s encouraged formative practice but did so within an accountability regime built on National Curriculum levels, which incentivised the frequent generation of summative level judgements dressed up as formative feedback. The abolition of levels in 2014 and the Commission on Assessment without Levels (Department for Education, 2015) were in part a response to this distortion, intended to free schools to design assessment that genuinely served learning. In practice, the removal left many secondary departments without a shared language for describing progress, and some reintroduced level-like grading systems under new names, so that the reform’s formative intentions were partly absorbed by the gravitational pull of accountability. Implementation, in short, is mediated by workload, accountability, and professional development in ways that the foundational texts tended to underplay.
The claims made for formative assessment’s impact on attainment have been both influential and contested. Black and Wiliam’s (1998) review reported substantial learning gains from formative practice, citing effect sizes they placed broadly in the region of 0.4 to 0.7 — a range that, once repeated in policy documents, did a great deal to justify national investment. Subsequent scholarship has treated these figures with growing caution. Kingston and Nash (2011), in a meta-analysis explicitly designed to test the earlier claims, reported a substantially more modest average effect in the order of 0.20, and observed that the number of methodologically robust studies permitting confident causal inference was surprisingly small given the field’s prominence.
The discrepancy is instructive rather than simply deflationary. It arises partly from the definitional breadth discussed above, since Black and Wiliam aggregated studies of very different practices, and partly from variation in how gains were measured and over what interval. Coe et al. (2014), reviewing the broader evidence on effective teaching, were correspondingly measured, treating formative practices as part of a repertoire of effective pedagogy rather than as a stand-alone guaranteed lever. The pattern that emerges is not that formative assessment fails to raise attainment, but that its effects are real, variable, and heavily dependent on the quality of enactment — a conclusion markedly more qualified than the headline claims that drove its policy adoption.
In the secondary phase specifically the evidence is thinner still, and much of what exists is inferred from whole-phase or primary-weighted samples. This matters for the present review’s central question, because the backwash of terminal examinations, the subject-specialist organisation of teaching, and the intermittent contact between teacher and class may all modulate the mechanisms that the general literature identifies. The safest reading of the evidence base is that it establishes a strong prima facie case for formative practice while leaving its precise contribution to secondary attainment under-specified.
Appraised as a body, the literature exhibits several recurrent weaknesses alongside its genuine achievements. The first is construct validity. As Bennett (2011) argues, formative assessment is less a single, well-defined intervention than a family of loosely related practices, and meta-analyses that pool them risk comparing the incomparable; a reported average effect size, however reassuring, can conceal enormous heterogeneity in what was actually done in classrooms. The second is currency and transferability: much of the foundational evidence is now dated and drawn from international contexts, yet it continues to be cited in UK policy as though directly applicable, with the particularities of the English examination system and the post-levels accountability regime rarely controlled for.
A third weakness concerns implementation fidelity. Because the “letter versus spirit” distinction (Marshall and Drummond, 2006) means that nominally identical interventions may be enacted in radically different ways, studies that do not observe classroom practice directly cannot be confident about what produced any measured gains; the independent variable is, in effect, only loosely defined. A fourth is the unevenness of the research-design base. Rigorous randomised or quasi-experimental studies remain comparatively scarce, as Kingston and Nash (2011) noted, and the field has relied heavily on small-scale teacher-partnership studies that are rich in professional insight but limited in generalisability, and that are sometimes conducted by advocates of the practice under study.
This last point raises a fifth and more delicate issue: the risk of confirmation bias in a field so closely allied to an advocacy movement. The normative appeal of “assessment for learning” — who, after all, would argue for assessment against learning? — can make null or negative findings harder to foreground, and can encourage the uncritical repetition of early, favourable effect sizes long after they have been qualified. A related concern is the translation gap between research and policy: findings generated under carefully supported project conditions have been scaled nationally as mandated techniques, a move the original researchers did not always endorse and which the fidelity evidence suggests was unlikely to reproduce the original gains. None of this invalidates the central insight that using assessment evidence to adapt teaching is sound pedagogy; rather, it should temper the confidence with which specific attainment gains are promised. The more defensible position is that formative assessment is a necessary component of effective teaching whose benefits are contingent, context-sensitive, and dependent on sustained professional learning rather than on the adoption of discrete techniques.
Several gaps follow from this appraisal, and together they define a clear agenda for the contemporary UK secondary context. The most pressing is the near-absence of robust, subject-specific evidence on formative assessment at Key Stage 4 under the reformed 9–1 GCSE and the post-levels assessment landscape. The literature that policymakers continue to cite largely predates these reforms, and comparatively little is known about how secondary departments have reconstructed formative practice in the absence of a national levels framework (Department for Education, 2015).
A second gap concerns equity. Although formative assessment is frequently advanced as a lever for narrowing the disadvantage gap, there is limited UK secondary evidence on whether its benefits are distributed evenly across pupil groups, or whether approaches that lean heavily on self-regulation and self-assessment risk advantaging already-confident and well-supported learners. A third gap is longitudinal: most studies measure proximal gains over a few weeks or a single term, leaving open the more consequential question of whether formative practice produces durable improvements in terminal examination attainment. A fourth concerns the mediating role of teacher professional development, which the implementation literature repeatedly identifies as decisive yet rarely isolates and measures as a variable in its own right. Finally, the rapid spread of digital and adaptive assessment platforms has outpaced independent research into whether technology-mediated feedback reproduces or dilutes the relational, dialogic mechanisms that the classroom literature identifies as central. A study combining direct observation of enactment with longitudinal attainment data in reformed GCSE subjects would address several of these gaps simultaneously, and would be of particular value to teachers, leaders, and policymakers alike.
This review set out to establish what the literature reveals about the role of formative assessment in raising attainment in UK secondary schools, and three conclusions are warranted. Conceptually, formative assessment is best understood not as a discrete intervention but as a functional orientation — the use of evidence to adapt teaching and learning — whose definitional breadth has both enabled its spread and weakened confident claims about its effects. Empirically, the mechanisms most strongly supported are those connected to high-quality, actionable feedback and to responsive classroom dialogue, but their benefits are realised only when the spirit, and not merely the letter, of the practice is enacted.
Evidentially, the strong effect sizes that propelled formative assessment into English policy have not been consistently replicated, and the more credible position is that its impact on attainment is genuine but moderate and highly contingent on context and implementation. For the secondary phase in particular, the research base has not kept pace with the policy changes of the past decade, leaving teachers and leaders to reconstruct formative practice with limited domestically relevant evidence. The enduring contribution of the field is therefore less a guaranteed technique for raising grades than a well-founded principle: that assessment is most valuable when it informs the next step in learning. Translating that principle into reliable attainment gains in reformed UK secondary classrooms remains an unfinished, and eminently researchable, project.
Assessment Reform Group (2002) Assessment for Learning: 10 Principles. London: Assessment Reform Group.
Bennett, R.E. (2011) ‘Formative assessment: a critical review’, Assessment in Education: Principles, Policy & Practice, 18(1), pp. 5–25.
Black, P., Harrison, C., Lee, C., Marshall, B. and Wiliam, D. (2003) Assessment for Learning: Putting it into Practice. Maidenhead: Open University Press.
Black, P. and Wiliam, D. (1998) ‘Assessment and classroom learning’, Assessment in Education: Principles, Policy & Practice, 5(1), pp. 7–74.
Butler, R. (1988) ‘Enhancing and undermining intrinsic motivation: the effects of task-involving and ego-involving evaluation on interest and performance’, British Journal of Educational Psychology, 58(1), pp. 1–14.
Coe, R., Aloisi, C., Higgins, S. and Major, L.E. (2014) What Makes Great Teaching? Review of the Underpinning Research. London: Sutton Trust.
Department for Education (2015) Final Report of the Commission on Assessment without Levels. London: Department for Education.
Education Endowment Foundation (2021) Teacher Feedback to Improve Pupil Learning: Guidance Report. London: Education Endowment Foundation.
Hattie, J. (2009) Visible Learning: A Synthesis of Over 800 Meta-Analyses Relating to Achievement. London: Routledge.
Hattie, J. and Timperley, H. (2007) ‘The power of feedback’, Review of Educational Research, 77(1), pp. 81–112.
Kingston, N. and Nash, B. (2011) ‘Formative assessment: a meta-analysis and a call for research’, Educational Measurement: Issues and Practice, 30(4), pp. 28–37.
Marshall, B. and Drummond, M.J. (2006) ‘How teachers engage with Assessment for Learning: lessons from the classroom’, Research Papers in Education, 21(2), pp. 133–149.
Torrance, H. (2007) ‘Assessment as learning? How the use of explicit learning objectives, assessment criteria and feedback in post-secondary education and training can come to dominate learning’, Assessment in Education: Principles, Policy & Practice, 14(3), pp. 281–294.
Wiliam, D. (2011) Embedded Formative Assessment. Bloomington, IN: Solution Tree Press.
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