Modularity

As an IT Project Manager, we like to decompose the solution in to understandable modules to help us conceptualize the solution and to help us build quickly.  Here is an AWESOME example of modular engineering from WWII:

This illustrates what we need to achieve.  That is, the ability to grab a sub component quickly - to fix or replace it - and to reintegrate the solution very quickly.

Enjoy the video.