The production mechanisms of traits: Reflections on two amazing decades

I am filled with a great deal of gratitude to see the progress, diversity, and excitement of research on within-person variability in personality. I argue for the value of studying states of a diverse array of contents, as represented in this special issue. The value of studying states is represented by four advances states facilitate: (i) evaluating the multipotency of personality; (ii) discovering the production mechanisms by which traits cause trait manifestations; (iiii) testing the causal effects of personality; and (iv) opening up new approaches to questions about personality. I present a series of conceptual commitments that enhance the value of studying states, and then I discuss how and why those conceptual commitments actually do enhance the value of studying states.