How do you keep a team from collapsing?

[pakrat]

My team, the Ratpak, is a small, closely knit group of dedicated students that work hard and really get a lot of stuff done. This pre-season, though, we have run into somemembership crises. Just two questions:

1. If your team gets new members, whats the best way to get them involved?

2. If a long-faithful member leaves on conditions of returning, how are you supposed to act? Do you just change your team, or do you lose the member?