I totally agree with Matt, but sometimes a team is defined with the working ideology of the members. I worked in teams, who believed in ideology, that each member is most productive, when he comes at the same time and works all working days the same predefined working time. Others believe, that team members are more productive, when they wwork more on good days, and less on worse days. So sometimes it's an ideologic problem, cause members are getting mad, when the rules of ideology got broken.