John B. Carroll

John B. Carroll was a renowned American psychologist known for his work in educational measurement and cognitive abilities. He developed the Three-Stratum Theory of Intelligence, which models human intelligence across different levels—from broad abilities to specific skills—and helped improve how we understand testing and assessing intelligence. His research has influenced educational practices, emphasizing that intelligence is multi-faceted and can be measured in various ways. Carroll's work is foundational in psychology and education, contributing to more accurate and comprehensive assessments of individual abilities.