Campbell and Fiske

Campbell and Fiske developed the concept of construct validity in psychology, emphasizing the importance of measuring what you intend to measure. They introduced the idea of "multitrait-multimethod" approaches, which involves using different methods to assess multiple traits. This approach helps researchers determine if a test accurately reflects the psychological construct it aims to measure by comparing results across various methods. If different methods yield similar results for the same trait, the test is considered to have strong validity. Ultimately, their work helps ensure that psychological measurements are reliable and meaningful.