Perfect reusable components are not obtained at the first shot.

Ask not first what the system does; ask what it does it to!

As Mr. Nagle so competently points out, almost no one uses Eiffel; in fact until recently there were only 9 users. But now a 10th person just started, so we are holding a conference, appropriately titled the TENTH Eiffel USER conference, to celebrate.

I have always felt sympathy towards the biologists who accept to debate creationists. Now I also understand them better; one can fight opinions, not articles of faith.

Perfect reusable components are not obtained at the first shot.

Constants are widely known for the detestable practice of changing their values; we should prepare ourselves against the consequences of such fickleness

Software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification.