Good tips so far. One thing that helps is to clearly define who is responsible for what and keep it that way. What has always wrecked team efforts for me is a "fix your stuff" culture. It is always an excuse for someone to weasel out of something that should be doing by jumping onto someone else's work that is already partially done so they don't have to stick their necks out. If you ever hear someone say that they have to "fix" someone else's stuff it's usually a sign that they are too lazy and/or are not up to the tasks that they should personally be doing. It also creates division within the team as in order for someone to "fix" some else's stuff they have to call out another team member as being incompetent and creates a very toxic working environment.