Borgstede, MatthiasMatthiasBorgstede0000-0003-1071-9038Eggert, FrankFrankEggert2023-02-172023-02-172023https://fis.uni-bamberg.de/handle/uniba/58275In this article, we take the opportunity to elaborate on some aspects of our article “Squaring the Circle: From Latent Variables to Theory-Based Measurement” (Borgstede & Eggert, 2023) that gave rise to the concerns uttered by Hasselman (2023) and Slaney (2023), and to clarify why we think that theory-based measurement is indeed necessary and sufficient for the establishment of meaningful psychological measurement procedures. Moreover, we will illustrate how theory-based measurement might be accomplished in psychology by means of an example from behavioral selection theory.engcovariance based law of effectformal theory, measurement in psychologymultilevel model of behavioral selectiontheory-based measurement150articleurn:nbn:de:bvb:473-irb-582756