Team mood is very important, it's an indicator on how the project is going, a good mood is essential to exit from bad situations, a bad mood should be fixed as soon as possible. I never tracked the mood in a team (I think I'll in the future) and I reckon a graph like this: Grab it from the Agile Vital Signs Dashboard file, from the good blog all about agile. The end of spring/iteration retrospective could be the ideal moment to record the team mood. What's behind a good mood? Let's try to make it happen on the next iteration! What's behind a bad mood? Let's try to fix it creating some actions.