Lee J. Cronbach
A score is only as good as the decision it justifies.
American educational psychologist and psychometrician known for reliability, validity and program evaluation.
Good measurement asks not only whether a score is consistent, but what decision it justifies.
Who they were
Lee Cronbach asked what a test score really earns the right to claim. He gave the field its most-used measure of consistency, sharpened the meaning of validity, and argued that the same instruction can help one learner and fail another. Measurement, for him, was always in service of a decision.
Famous books
What they left on the shelf
Terms they cared about
Ideas worth knowing
Their techniques
How the work was done
Best known as a theorist — their ideas shaped the techniques of those who followed.
Their big idea
Reliability & Validity Theory
Lee Cronbach formalized how to judge measurement: reliability (is the score consistent, captured by Cronbach’s alpha?) and validity (does it support the intended interpretation?), and showed that the best treatment can depend on the person’s aptitudes.
Questions in their spirit
What they’d ask you
Sit with one. Answer online, or in the app.
Carry the idea forward
Cronbach — What they’d ask you
Psipas asks you one small, honest question at a time — and builds the picture from your answers.