Learn in the textbookProject Structure and Key Roles
DefinitionProject communications management (プロジェクトコミュニケーションマネジメント) plans who gets what, when and by which means among the people involved, and manages the flow so information reaches them as planned.
ExplanationWhen everyone talks one-to-one directly, n people give n(n−1)÷2 channels, a number that climbs quickly as the team grows. There are three ways to communicate: push (プッシュ型), where the sender delivers to the recipient; pull (プル型), where the recipient fetches the information when needed; and interactive (相互型), a two-way exchange on the spot. Whom to report to, when and how is settled at the start of the project, and decisions made in meetings are recorded in the minutes and shared with those concerned.
AnalogyIt is like a trip organizer who sends the meeting time to everyone at once, posts the detailed itinerary on a shared page for each person to check, and settles room assignments by talking it over together.
Memory hookCounting channels is the same as counting handshakes when everyone shakes hands with everyone else once. Each person shakes n−1 hands, and every handshake is counted twice, so divide by 2.