Edward Thorndike was an influential American psychologist known for his work in education and his foundational contributions to behaviorist psychology. He is best known for the development of the Law of Effect, which states that behaviors that produce pleasant outcomes are more likely to be repeated while those that result in unpleasant outcomes are less likely to occur. This principle laid the groundwork for operant conditioning and had a significant impact on both psychology and educational practices. Thorndike conducted experiments using animals, particularly cats, to observe their problem-solving behavior. His work demonstrated that learning occurs through trial and error, leading to the formulation of his theories on learning processes. His contributions extended beyond experimental psychology; he also emphasized the importance of systematic testing and measurement in education, advocating for more scientific approaches to teaching. Throughout his career, Thorndike authored numerous books and articles, focusing on topics such as intelligence and assessment in education. He believed in the importance of applying psychological principles to enhance learning outcomes and the general effectiveness of education. His innovative ideas continue to influence educational psychology and the understanding of learning mechanisms. Edward Thorndike was an American psychologist who greatly impacted education and psychology through his research. He is particularly remembered for formulating the Law of Effect, which revolutionized our understanding of behavior and learning. His experimental work with animals helped shape his views on trial-and-error learning, while his emphasis on measurement and assessment significantly influenced educational practices.