Local Norms: Comparing Children to Their Context

Two schools use the same ability test and the same cut-off. In one, a pupil scoring at the 85th national percentile is unremarkable; in the other, the same score is the strongest result the school has seen in years. National norms say these children are identical. Every teacher knows they are not — and the measurement literature agrees with the teachers.

The case for local norms

Lohman (2005) argues that identification should compare children with others who have had similar opportunities to learn — because the question a school is actually asking is not “where does this child rank nationally?” but “which of our children most need provision beyond our standard curriculum?” That question is inherently local. A child far ahead of their immediate peers needs stretch regardless of national standing; a school that identifies only by national thresholds will over-identify in privileged intakes and under-identify everywhere else.

Excellence gaps

Plucker and Peters (2016) documented the systemic version of the problem: “excellence gaps” — large, persistent differences in the proportion of disadvantaged and minority students reaching the highest performance levels, gaps that mirror and often exceed those at the proficiency floor. Their argument is that equity work which stops at basic attainment quietly concedes the top to the already advantaged. Local norming, universal screening and front-loaded enrichment — offering challenge before identification, so ability has something to show itself on — are the levers with evidence behind them.

Getting the balance right

Local norms are a lens, not a lowering. The provision a locally-identified learner receives must still stretch them from their actual starting point — the point is to stop the postcode deciding who gets asked hard questions. A sensible identification stack reads both: national norms for calibration, local norms for decision, multiple measures throughout, and everything revisited on a cycle.

Our school dashboards are built around each school’s own cohort — context first, comparison second: the Talent Framework.

References

Lohman, D. F. (2005). The role of nonverbal ability tests in identifying academically gifted students: An aptitude perspective. Gifted Child Quarterly, 49(2), 111–138.
Plucker, J. A., & Peters, S. J. (2016). Excellence Gaps in Education: Expanding Opportunities for Talented Students. Cambridge, MA: Harvard Education Press.