Adequate Architecture Up Front

Even in XP there are things you need up front. These include:

• Appropriate tools to the problem domain.
• A team skilled with those, and willing and able to go XP.
• Customers willing to commit time to their involvement in the process.
• A SystemMetaphor.
• StarUnit and an SCM appropriate for your tools.
• At least one satisfactory SpikeSolution.
• An initial CommitmentSchedule full of UserStories.

All these things are architectural.