Empirical proof of the Conway's law has been published

An old software project management axiom, otherwise known as Conway's law stated that any piece of software reflects the organizational structure that produced it. Forty years after Melvin Conway formulated it, it has been empirically validated by a team of Harward Business School researchers.

They compared several software products, including open-sourced and closed-sourced ones, and concluded that distributed teams tend to develop more modular products.