Controlled Variables are Perceptual Variables

[amatic]

Sorry, here is the source of the quote. Looks like Bill was writing a short description of PCT.

PCT and manual control

[From Bill Powers (930923.1930 MDT)] Chris Wickens (9309xx) -- I'm gradually learning from experience: before we get into a big discussion about PCT vs. the manual control literature, we're going to have to get our terminology straightened out. We use terms differently in PCT from the way they're used in standard control engineering. When we say "input" we don't mean the reference signal, but the variable being sensed by the system at the input boundary between system and environment; wh…