We can sometimes assume that the whole will be as good as each of its parts. Suppose, for example, you're in charge of a startup, and you know that everyone you've brought on board is productive and efficient. It might seem logical to assume that, as a result, the startup will be productive and efficient, too ─ but this isn't necessarily true. The fallacy of composition fails to allow for how the different "parts" interact with each other ─ if, for example, your efficient administrator and your highly skilled head of IT each assumes the other is in charge of collating prototype test results, then you have a problem. Equally, a unit composed of good people can still be working on a doomed project, and a project composed of good ideas may lack a stable center. When assembling a team with a common goal, always check the overall view as well as the individuals involved.