In this episode, we discuss the problems associated with vague concepts in psychological science. We talk about the jingle-jangle fallacy, the trade-off between broad concepts and more precise concepts, if we should generate databases of conceptual definitions, and how the reward structures can get in the way of specifying concepts clearly.   Aikins, H. A. (1902). The principles of logic. H. Holt and Company. https://www.loc.gov/resource/gdcmassbookdig.principlesoflogi00aiki/   Chalmers, D. J. (2025). What is conceptual engineering and what should it be? Inquiry, 68(9), 2902–2919. https://doi.org/10.1080/0020174X.2020.1817141    Gerring, J. (1999). What Makes a Concept Good? A Criterial Framework for Understanding Concept Formation in the Social Sciences. Polity, 31(3), 357–393. https://doi.org/10.2307/3235246    Hirsch, P. M., & Levin, D. Z. (1999). Umbrella Advocates Versus Validity Police: A Life-Cycle Model. Organization Science, 10(2), 199–212. https://doi.org/10.1287/orsc.10.2.199    Sartori, G. (1970). Concept Misformation in Comparative Politics. The American Political Science Review, 64(4), 1033–1053. https://doi.org/10.2307/1958356    Thorndike, E. L. (Edward L. (with University of California Libraries). (1904). An introduction to the theory of mental and social measurements. New York : Science Press. http://archive.org/details/theoryofmentalso00thor   Truman Lee Kelley, (1927). Interpretation of education measurements. World book company. http://archive.org/details/bwb_P9-AQI-186   APA Dictionary of Psychology: https://dictionary.apa.org/