As with Activity: Define a Candidate Architecture, this activity is best carried out by a small team staffed by cross-functional team members. Issues that are typically architecturally significant include performance, scaling, process and thread synchronization, and distribution. The team should also include members with domain experience who can identify key abstractions. The team should also have experience with model organization and layering. From these inputs, the team will need to be able to synthesize a model, or even a prototype, of a solution.