The programs that run on our computers are dynamic.  Rather quickly, they can be shaped and formed to suit the needs of end users. As long as software bloat/feature creep is kept under control, customization and modification remain two critical ingredients in the evolution of any application.  Who will make these changes, and how easy will it be?  This is common sense stuff, but it's a subject that doesn't get discussed nearly enough, and a subject that is very often overlooked or ignored by choice.