The most robust definition (and the most commonly cited) seems to be found in Barbara Gray's Collaborating: Finding Common Ground for Multiparty Problems. She describes collaboration as "a process through which parties who see different aspects of a problem can constructively explore their differences and search for solutions that go beyond their own limited vision of what is possible."[5] In Collaborative Leadership, David Chrislip and Carl Larson offer a slightly different but also useful definition: "It is a mutually beneficial relationship between two or more parties who work toward common goals by sharing responsibility, authority, and accountability for achieving results."[6]