Before revision:  A general model is set up where many of the terms affecting parallel processing are listed and the validity of neglecting certain terms in different approximations are scrutinized , with special emphasize on the famous scaling laws of parallel processing.
After revision:  We set up a general model and list many of the terms affecting parallel processing are listed and the validity of neglecting certain terms in different approximations are scrutinized , with special emphasize on the famous scaling laws of parallel processing.