From HundredPersonProject:
There seems to be a hidden assumption on this page - that a HundredPersonProject (100-PP) is going to have WorseManagement than a ten-person project (10-PP).
If good management is defined as the ability to produce an application on time and on budget, and if we assume the management of a 100-PP is of the same quality as that of a 10-PP, then the only discussion possible on this page would be what are the diminishing returns - i.e. will a successful 100-PP be 10 or 5 or 2 times as productive as a successful 10-PP. In other words, with the same quality management, a larger project will produce software sooner, but less cost effectively.
But that is not the discussion. The discussion is that a 10-PP is somehow better. Which seems to imply that we are assuming that the 100-PP is going to have WorseManagement. Why?
Typically, because of the increase in communications paths, the increase in managers (which increases to odds of getting bad managers), and the loss of small-team cohesion. --PeteHardie