Ruth Butler
Israeli educational psychologist, long associated with the School of Education at the Hebrew University of Jerusalem. The research programme that matters for this topic is a series of papers through the late 1980s and early 1990s on what happens when scored feedback (grades, marks) is delivered alongside evaluative feedback (comments). The 1988 British Journal of Educational Psychology paper is the best-known of these; the follow-up papers in Journal of Educational Psychology (1987) and elsewhere extended the programme. Her later work on teacher motivation and on achievement goal orientations sits inside the same wider framework of how performance-evaluation conditions shape learning behaviour.
Stake§
Butler's stake is the academic one of a researcher who established an experimental finding the implications of which remain inconvenient for the institutional grading apparatus that most schools and universities run. The 1988 finding — that students who received grades plus comments improved less than students who received only comments — has been replicated enough times to be a stable result in the literature, but the structural implication (that schools should consider not attaching grades to formative feedback) is hard to act on inside grade-required institutions.
The 1988 study is the standard empirical reference for the claim that scored feedback undermines the learning effect of formative comments. Butler assigned twelve-year-old students in five Israeli schools to three feedback conditions on divergent-thinking tasks: comments only, scores only (numerical grades), or comments-with-scores. The students who received comments only improved their performance over the experimental period; the students who received scores only did not improve; the students who received both did not improve either. The comments-only group also reported higher task-involving interest in the work — the orientation toward improving at the task itself — while the scored conditions shifted students toward ego-involving concerns about how they compared with classmates.
The interpretation Butler offered, and which the subsequent literature has largely accepted, is that the score acts as a summary judgement that diverts attention from the diagnostic content of the comments. The student who reads 6/10 with a comment about how to improve the third paragraph attends to the 6/10 and treats the comment as explanation for the score rather than as instruction for the next attempt. The student who reads only the comment has nothing to compare against and attends to the instruction. The mechanism is one of attention allocation rather than motivation in any deep sense; what the score does is occupy the slot where the formative information would have been processed.
The result has been replicated in multiple subsequent studies across age groups and domains. The structural implication — that grading and formative function pull against each other — is the empirical anchor for several arguments in the topic's grading-reform side. Hattie and Helen Timperley's 2007 synthesis cites Butler's result as the empirical case for why self-level feedback (which scores tend to become) hurts. The ungrading argument (Blum 2020, Kohn 2011) treats Butler's finding as the empirical core of the case for removing scores from formative assessment.
Butler has continued to publish on motivation and assessment into the 2010s, with later work focused on teachers' achievement goal orientations and how they shape classroom practice. The 1988 study remains the work she is most-cited for; the structural implication remains contested in practice even where the result is not contested in research.