Conceptual Issues in CSEM Estimation and Interpretation: Commentary on Pfadt et al.

Pfadt et al. (2026) present accessible methods for estimating conditional standard errors of measurement (CSEMs) and implement them in the open-source software JASP.Their emphasis on individual-level precision represents an important contribution to applied measurement practice.This commentary discusses several conceptual issues that clarify and extend the authors' treatment of dimensionality, error definition, and score interpretation.The aim is to strengthen alignment between CSEM estimation and the interpretive purposes for which test scores are used.