I'm quite aware of how Boeing does things; I've had experience with their processes and rules.Pistonboy knows some stuff for sure [anybody that owns a 914 is okay with me!]. We [Boeing] have a thing the call "First Article Verification" on new parts to verify the fit and function of the new part will work in the assembly. Using that method of thinking, I think there'll be input from all the "experts", but the final input will be given by the fleet sales drivers in real-world situations. Their input will be taken into consideration, and Elio slightly "tweaked" to get the desired result. I seriously doubt [and pray] that there will be any "significant" changes to the E5 design, if for no other reason that the expenditure required to do so. The again, an F-15 will run you around $80 million, so there could be errors in my thinking when it comes to autocycles.
I lived with one of the heads of payroll in Auburn; she used to tell me a lot of inside information on the different departments and how that one company is actually 100's of separate orgs under one roof. She took me up to Everett when they did the employees only roll out of the triple 7.
Although some of the rules are the same in other corporations, there is a lot of variance in how a lot of things are handled.
Boeing does steps that I don't think anyone even comes close to copying to the letter. Some things yes, most, no; the Boeing industry is very different from others.