Effective communication is very easy to identify. Either it produces the required results (everyone understanding the problem and cooperating to produce and implement as close to an optimal solution as possible given resource constraints) or it doesn't.
> Either it produces the required results (everyone understanding the problem and cooperating to produce and implement as close to an optimal solution as possible given resource constraints) or it doesn't.
And how can you tell? If a project fails, is that because people didn't have a shared understanding of the problem, or did they understand it fine and just weren't able to find a solution?