"15. (Shea's Law) The ability to improve a design occurs primarily at the interfaces. This is also the prime location for screwing it up." From Akin's Laws of

"15. (Shea's Law) The ability to improve a design occurs primarily at the interfaces. This is also the prime location for screwing it up." From Akin's Laws of Spacecraft Design: http://spacecraft.ssl.umd.edu/akins_laws.html http://spacecraft.ssl.umd.edu/akins_laws.html