William A. Dembski, in his The Design Inference, attempts to propose a rigorous, well-defined mathematical criterion for detecting design. Some critics argue that this criterion, though well-defined, admits counterexamples. Others, like Robin Collins, argue that the criterion is not even well-defined. In this response, Dembski argues that his criterion for detecting design is indeed well-defined. Mr. Dembski is Associate Research Professor in the Conceptual Foundations of Science at Baylor University.