Early in the Apollo Program, considerable difficulty was experienced in the exchange, standardization, and dissemination of critical data required both by and from the mission planners. In view of the interdependency of most mission-planning milestone documents, the need for coordination and tight control in disseminating these data became acute. As a result, the Apollo Spacecraft Program Office in conjunction with the hardware contractors and operational elements exercised strict controls and procedures in governing mission-planning data. As a part of this program, most organizations appointed key personnel on a full-time basis to support the data-management network. In retrospect, this action must be regarded as vital in consolidating and strengthening the Apollo mission-planning process.