The original impetus for the design of our professional development (PD) program came from the first author's interest in PD in general and what makes it effective. We begin our presentation with a brief explanation of the core literature that affected our thinking and then introduce the context in which and for which the PD program was designed. This is followed by a presentation of the steps we took to design our PD program with 4C/ID. For ease of reading, we split the design process into 15 distinct steps, each focusing on a major milestone in the design process and introducing the challenges we faced during the process. We finish the presentation with our reflections on the design process and final remarks.