The purpose of the present investigation was to test three rival measurement models of a common measure of trait communication apprehension, the PRCA-24. The rival models include a linear, unidimensional model, a Guttman simplex, and a second-order factor structure. These models are discussed in terms of their conceptual implications, their psychometric properties, the empirical evidence needed for their support, and their implications for both prior and subsequent research. To test these models, a nationwide sample of responses to the PRCA-24 (N=8879) was analyzed. The results of a variety of statistical procedures indicate that the second-order factor model best fits the data. This model is consistent with prior conceptual work by McCroskey (1984a) and was replicated with two additional data sets. © 1990, Taylor & Francis Group, LLC. All rights reserved.