Who generated the procedures? Was it me or someone else? How are the procedures defined by the testing criteria? Surely a procedure is a sequence of steps toward some goal, and does not have a definition.

mattnewport has already answered the rest, so I'll just fill in this bit. What I said was:

And in general, the procedures you use will be defined by testing according to some predefined criteria, after being generated through creative and/or problem-solving processes.

Meaning, "the procedures you use" (e.g. for toast-buttering) "will be defined" (i.e., determined, circumscribed, narrowed, filtered, specified) "by testing" (to determine suitability) "according to some predefined criteria" (i.e., your criteria for what a successful result would consist of) "after being generated" (i.e., first you generate procedures, then you test them), "through creative and/or problem-solving processes" (i.e., either you generate improvements on, alternatives to, or solutions for problems in an existing procedure, borrow a procedure from someone else, or attempt to invent or derive one from scratch.)