To balance demand and supply of information, we propose a framework called “information supply chain” (ISC). This framework is based on supply chain management (SCM), which has been used in business management science. Both ISC and SCM aim to satisfy demand with high responsiveness and efficiency. ISC uses an information requirement planning (IRP) algorithm to reason, plan, and satisfy needers with useful information. We believe that ISC can not only unify existing information-sharing methods, but also produce new solutions that enable the right information to be delivered to the right recipients in the right way and at the right time. 1 The Information Supply Chain Framework Information-sharing refers to activities that distribute useful information among multiple entities (people, systems, or organizational units) in an open environment. Sharing information should consider four questions: 1) what to share, 2) whom to share with, 3) how to share, and 4) when to share. Better answe...