Editing Avionics software (section)

===Certification===
Each step produces a deliverable, either a document, code, or a test report.  When the software passes all of its tests (or enough to be sold safely), these are bound into a certification report, that can literally have thousands of pages.  The designated engineering representative, who has been striving for completion, then decides if the result is acceptable.  If it is, he signs it, and the avionic software is certified.