boss: i can't give you a good performance review because you haven't performed up to expectations.
wally: do you even know what my job is?
boss: of course i do. you're an engineer.
wally: yes, but do you know what projects i'm working on?
boss: well, various things, and some miscellaneous things too.
wally: how can you determine my job performance when you don't know what my job is?
boss: have you heard of heuristics? you're bad at everything i've observed, so i assume you are bad at everything else as well.
wally: you should have started with that.