It surprised me the difference a retrospective made. I didn't feel comfortable that we were skipping them, even thought the project was happily adapting on the fly. Retrospectives had been tried on a previous project and had not gone well. So, after 4 months of development we finally did our first retrospective. The project was in excellent shape, so it was a good opportunity. I was really amazed at the positive effect it had. What was most interesting to me was the effect the event had on the group -- we really started to gel as a team.
From 5 Stages of Group Development:
forming -> storming: risk conflict. 'To grow from this stage to the next, each member must relinquish the comfort of non-threatening topics and risk the possibility of conflict.'
storming -> norming: listen. 'The most important trait in helping groups to move on to the next stage seems to be the ability to listen.'
norming -> performing...'The Performing stage is not reached by all groups. If group members are able to evolve to stage four, their capacity, range, and depth of personal relations expand to true interdependence.'