Within multi-component lifestyle interventions, how do we know what people are using and how they are using them? How do we know if they work? Identifying elements critical for successful outcomes can drive intervention improvements. e-Learning methods offer a unique opportunity to build the skills to effectively change lifestyle behaviors, improve engagement with intervention materials through interactive content, and provide greater precision in determining how individuals engage with the materials. This presentation will describe the design and development of e-learning modules as part of a behavioral weight control intervention, introduce software (Articulate 360) that can be used to develop engaging and interactive e-learning experiences, and share lessons learned from the good, the bad, and (yes) the ugly!