Workstreams are a powerful way to group milestones together. In a plan with many milestones spreading them across workstreams keep things easy to understand. You can also add a description for the Workstream, and assign an owner to it. Workstreams can represent areas of work, a specific objective, sub-teams or anything else that you find helpful. Workstreams provide a way to delegate responsibility for areas of a project, especially where team members only have ‘view’ access to the plan.