Before becoming Twitter CEO in 2010, Costolo worked at Google for two years working with Susan Wojcicki.
Two things he noted in a recent interview as significant while there, in terms of management in large organizations, was:
1) OKR (Objectives and Key Results) – benchmarking yourself against goals you set every quarter is important not only as a performance evaluation, but more importantly as a communication vehicle. Said Costolo, “It was a super effective way of communicating context to other teams about what you’re trying to do and what you’re trying to accomplish.”
2) Make sure everybody understands what you understand. This ties into people understanding the context of why you’re trying to do what you’re doing.