>As a system dynamicist I will say that all models are _incomplete_ but are
>*not* necessarily wrong. A model is only an approximate structural
>makeup of the real process based on the _observable_ phenomena at the time.
This is an excellent distinction. In fact, the popular mental models I
refer to are frequently adequate, and flaws only become apparent when the
models are nearly universally applied.
-- Rol Fessenden 76234.3636@compuserve.com