By era
Modern, 1904 to present
2 entries
Concept
Reliability and Validity
The two axes of measurement quality: reliability is whether a measure is consistent, validity is whether it measures the thing it claims to.
8 min
ConceptTheories of Intelligence
From Spearman's single general factor to Gardner's many independent intelligences, the century-long argument over whether mental ability is one thing or many, and what IQ tests actually capture.
7 min