I've always enjoyed organizing a group, so I have often been given/taken a coordinating role along with my role as a level designer.
LEVEL DESIGN COOPERATION
In every project, I and my level design colleagues have worked closely together. We often iterate on each other levels and have an open discussion on what's good and bad. To be able to take and give feedback and then iterate on those thoughts is very important for my development as a designer.
This is a summary and an example of how my contributions and cooperation can look like in different stages of a project.
Creating documents regarding the game and its mechanics, for other disciplines to refer to.
Blocking out the levels to get a feeling for basic movement and camera angle.
Build the levels using assets provided from the graphical artists, and communicating problems back to them.
Request variables from programmers, to be able to make quick changes while playtesting.
Playtest the levels and mechanics and iterate these from the incoming feedback.
Playtest levels and mechanics.
Finalize levels and metrics.