Lee J. Cronbach

Lee J. Cronbach was an influential psychologist best known for developing the concept of internal consistency, specifically through his creation of Cronbach's alpha—a statistical measure used to assess how reliably a set of survey or test items measures a single concept. His work helped improve the validity of psychological and educational assessments, ensuring that tests accurately reflect what they intend to measure. Cronbach's contributions have had a lasting impact on research methodologies, emphasizing the importance of reliable, consistent measurement in social sciences.