The team leader (who may be a Black Belt, or someone working closely with a BB or MBB) has overall responsibility for making sure the work of the team gets done. Those responsibilities start before the team comes together, and continue after the team has disbanded.
The team leader gets the team started. Tool 1-1 outlines what the team leader should do to prepare for the first meeting. For some projects, the team leader may be asked to select or recommend members of the project team. Tool 1-2 gives principles and guidelines for selecting team members.
Tool 1-1.
Tool 1-2.