Online course design is an emerging practice in higher education, yet few theoretical models currently exist to explain or predict how the diffusion of innovations occurs in this space. This study used a descriptive, quantitative survey research design to examine theoretical relationships between decision-making style and resistance to change among higher education online course designers and the potential influence on the diffusion of innovations in online course design. The original theoretical model proposed in this study was partially supported. This study found that online course designers in higher education were diverse with regards to training and experience for designing online courses and that an online course designer's decision-making style does not likely contribute to their level of resistance to change. In addition, the majority of online course designers in this study were rational decision-makers, reported a generally low resistance to change, and responded to change situations with cognitive rigidity. Four "types" of online course designers were identified based on decision-making style, resistance to change, and response to change situations. These types were classified as: reactors, visionaries, traditionalists, and planners. The study concluded that the lengthier and more detailed decision-making processes of rational decision-makers and the rigidity of online course designers' willingness to change perspectives likely moderates the diffusion of innovations in higher education online course design. In addition, the types of online course designers identified in this study informed the development of a revised theoretical framework for explaining how the combination of these characteristics may influence how online course designers contribute to the diffusion of online course design innovations. The types of online course designers may also be used to develop customized tools and strategies for promoting innovative online course design practices. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]