The Agile Developer's Handbook

Communication lines

5 team members results in 10 lines of communication, as shown in the following diagram:

If we increase the team size to 10 team members, the number lines of communication jumps to 45, as shown here:

The formula is as follows:

So, 15 team members would have 105 communication lines to maintain, 20 team members would have 190, and so on.

Different teams will experience different results, but at 10 or more team members face-to-face ...