Before revision: An information silo , or a group of such silos, is an insular management system in which one information system or subsystem is incapable of reciprocal operation with others that are, or should be, related.
After revision: An information silo occurs when information isn't shared between departments or divisions of a group or a group of such silos, is an insular management system in which one information system or subsystem is incapable of reciprocal operation with others that are, or should be, related.