There are times when some of your peers won’t collaborate. Once you figure out why, you may be able to address the specific issues.
These are some reasons people don’t collaborate:
Someone is playing a zero-sum game.
Someone feels as if information hiding will help their career, instead of sharing information with everyone.
You and your colleagues do not share a common goal or strategy.
Managers reward people for individual achievements instead of for the success of the larger group.
You don’t have enough senior managers involved who can make decisions that stick.
People are stuck on their positions about projects in the portfolio and have not articulated their principles.
You are not meeting in one location ...