Rule #65: In olden times, engineers had hands-on experience, technicians understood how the electronics worked and what it was supposed to do, and layout technicians knew too—but today only the computer knows for sure and it’s not talking.
http://www.oliverlehmann.com/project-management-sources/Nasa-Hundred-Rules-for-Project-Managers.pdf (“NASA: Hundred rules for Project Managers”)
Abacus Noir 