[scottmp10]

While I agree with the current comments for the most part, I have found communication to be a really significant part of team relations. Often, this type of problem compounds and I have seen similar situations end with a member leaving the team.

That being said, I have found that this type of issue can usually be solved by talking about what your expectations are and being clear when they are not met. Just make sure that your expectations are reasonable and leave room for error here and there.

Finally, you need to decide if you are ok with having your teammate working part time. Someone splitting their time between two projects usually contributes less than half of their potential to each team.

As others have mentioned, the fact that he has been meeting his deliverables probably means that the issue is less about contribution and more about communication. If you cannot solve the communication issues then you may want to look at alternatives without this partner.