Incorporating Less Frequently Available Team Members

[Darbus]

One issue that most teams must presumably grapple with is that of team members who only show up for a couple of hours a week during build season- those who aren't present often enough to be given a major project, and who won't necessarily know what needs working on when they are in attendance, but who are still valued members of the team, and are sets of hands during crunch times.

What are strategies people have found helpful in involving team members who can't be there as often or for as long as other members of the team?