Review any reports of conflict between each of the team members over the last two years, and select only those with a track record of working well together.

Ensure there is a balanced mix of people who are experts and members with broad experience based on the work to be performed and determine training needs.

Ensure that none of the team members are geographically dispersed so that all team members can be colocated.

Review each team member's contributions to the velocity of their previous projects and select the highest performers.