Joel West discusses how open innovation can help firms leverage external knowledge. Open innovation involves purposeful inflows and outflows of knowledge across firm boundaries to accelerate internal innovation. There are different types of open innovation strategies like inbound, outbound, and collaborative openness. Examples include Procter & Gamble's Connect + Develop program that sources one-third of new product technologies externally, and Dolby Labs that commercializes its audio technologies through licensing. Other examples are standards consortia like IETF that develop shared protocols, R&D consortia like ELSIE that share safety data, open source software projects, and crowdsourcing problems through intermediaries like InnoCentive to tap diverse knowledge. Open innovation changes firms' roles