Phase 3: Build the core
This is the initial conversion from the
rough design into a compiling and executing body of code that can be tested, and
especially that will prove or disprove your architecture. This is not a one-pass
process, but rather the beginning of a series of steps that will iteratively
build the system, as you’ll see in phase 4.
Your goal is to find the core of your
system architecture that needs to be implemented in order to generate a running
system, no matter how incomplete that system is in this initial pass.
You’re creating a framework that you can build upon with further
iterations. You’re also performing the first of many system integrations
and tests, and giving the stakeholders feedback about what their system will
look like and how it is progressing. Ideally, you are also exposing some of the
critical risks. You’ll probably also discover changes and improvements
that can be made to your original architecture – things you would not have
learned without implementing the system.
Part of building the system is the
reality check that you get from testing against your requirements analysis and
system specification (in whatever form they exist). Make sure that your tests
verify the requirements and use cases. When the core of the system is stable,
you’re ready to move on and add more