Project Requirements --> Project Engineering --> System Studies --> System Specification --> Solicit RFQ's from vendors for boxes/system components ...
To be completed by each vendor/contractor:
Creation of a project engineering team, a QA/QRA engineering group and a manufacturing group.
Engineering does (sometimes iterative) product development an development utilizing on-site model shops to crank out the first prototypes, engineering also produces at this time prints/drawings via CAD/CAM, writes test procedures, performs/cooperates with QRA to perform testing against spec on any systems built/proposed.
Part of this process includes any and all and even more of the following: Drawings, test fixtures, training of assembly personnel, training of QA inspectors, construction of test sets to verify the electronics, buyers solict components from lower level vendors of commodity items as well as those special space qualified/space qulaifiable 'parts' and on and on ...