Research on perceived online service quality has, since its beginnings in the 1990’s, shown little consensus about its dimensionality. In this study, we modify a well-tested existing instrument to add the notion of transaction quality. We carry out exploratory factor analysis and find that our results disconfirm our a priori hypotheses about the factor structure and some of the findings of previous studies. This raises questions about the about the ontology of the latent dimensions of online service quality.