This technical note explores open innovation--initiatives that are executed with organizations or individuals outside the typical boundaries of the R&D organization. Through a broadening of the interpretation of open innovation, the note aims to help managers who are trying to be more open with their innovation initiatives. Understanding what works or what doesn't work in different settings helps answer questions such as these: What types of projects are good candidates for open innovation? What should an open innovation portfolio look like? Or, more generally, how should firms manage open innovation initiatives?