Robert Ladd Thorndike[1] (September 22, 1910 – September 21, 1990) was an American psychometrician and educational psychologist who made significant contributions to the analysis of reliability, the interpretation of error, cognitive ability, and the design and analysis of comparative surveys of achievement test performance of students in various countries.
[3] He was president of the American Educational Research Association and the Psychometric Society.
With Irving Lorge, Thorndike published a standardized test in 1954 which later became, with the collaboration of Elizabeth Hagen, the widely used Cognitive Abilities Test.
Thorndike died of heart failure in September 1990 at the age of 79.
Teachers’ Expectations: Determinants of Pupils’ IQ Gains.