Contract First Design
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http://www.scrum-breakfast.com/2013/06/xm-principle-4-contract-first-design.html
This means design the interface between modules first - not the modules themselves.
When designing a solution:
- Design the interfaces based on outside parameters, e.g. load factors, or communication and power requirements.
- Only architect the connections up front, not the individual components.
- Leave room to grow, i.e. over engineer these interfaces, because changing these fundamental contracts may be expensive.