Online professional development is multidimensional. It encompasses: a) an online, web-based format; b) professional development; and most likely c) specific objectives tailored to and created for the respective online professional development course. Evaluating online professional development is therefore also multidimensional and as such both important and difficult. The purpose of this paper is to reflect on the structure of an evaluation model developed and used to evaluate a custom-built online professional development course, emphasizing how the evaluation model fits within and contributes to better understanding of online professional development evaluation. A hybrid model is conceptualized as one solution to this problem. The conceptualization of the hybrid model is presented in theoretical terms. This is followed by a concise summary of its application to an online professional development course. (Contains 6 figures and 2 notes.)