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Certified Business Analysis Professional (CBAP) · IIBA
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The formula for calculating the number of communication channels is derived from the fact that in a group of (N) people, each person can potentially communicate with every other person except themselves. 435*(435-1) = 188 790 When one person communicates with another, it creates a two-way channel - one from person A to person B and another from person B to person A. Hence, each pair of stakeholders adds two channels. However, when we calculate the total number of communication channels, each pair is counted twice (once for each stakeholder in the pair). Therefore, to avoid double-counting, we divide the result by 2. This ensures that each unique communication channel is counted only once. 188 792 / 2 = 94 395
BaBOKv2
The formula for this is in the Project management professional book. PMBOK