The only way for errors to occur in a program is by being put there by the author. No other mechanisms are known. Programs can't acquire bugs by sitting around with other buggy programs. Right practice aims at preventing insertion of errors and, failing that, removing them before testing or any other running of the program.
Hayley MillsEven when I became the typical shy adolescent, I never minded performing. I felt there was a kind of safety, a protection about being on stage, about losing myself in another character.
Hayley Mills