As Americans shift their work and leisure activities online, Extension seeks to remain viable by delivering programs through a website known as eXtension. eXtension is predicated on the voluntary labor of Extension specialists and educators who form Communities of Practice to create and deliver content through the website. Evaluation of eXtension CoP can be effectively executed using Patton's (2011) developmental evaluation model. A flow of activities for evaluating eXtension CoP using this approach is presented along with a case study of the Grape CoP evaluation using Patton's developmental evaluation model.