Recently, J. J. Starns and J. L. Hicks (2005) have argued that source dimensions are retrieved independently from memory. In their innovative experiment, manipulating the retrievability of 1 source feature did not affect memory for a 2nd feature. Following C. S. Dodson and A. P. Shimamura (2000), the authors argue that the source memory measure that Starns and Hicks used (known as the average conditional source identification measure) is vulnerable to a response bias in this particular paradigm, and this may undermine Starns and Hicks's conclusion. Starns and Hicks, however, acknowledged this possibility. The authors substantiate this claim by a simulation and by replicating Starns and Hicks's experiment. In 2 further experiments, the authors use an extended multinomial model to analyze data showing that Starns and Hicks's conclusion holds even if results cannot be attributed to response biases.