Editing Avionics software (section)

===Integration testing===
As pieces of code become available, they are added to a skeleton of code, and tested in place to make sure each interface works.  Usually the built-in-tests of the electronics should be finished first, to begin burn-in and radio emissions tests of the electronics.

Next, the most valuable features of the software are integrated.  It is very convenient for the integrators to have a way to run small selected pieces of code, perhaps from a simple menu system.

Some program managers try to arrange this integration process so that after some minimal level of function is achieved, the system becomes deliverable at any following date, with increasing numbers of features as time passes.