The book “NeXTstep Programming Step One: Object-Oriented Applications” by Garfinkel and Mahoney said this about Controllers in 1993:
A good rule of thumb is to place as little code in your controller as necessary. If it is possible to create a second controller that is only used for a particular function, do so – the less complicated you make your application’s objects, the easier they are to debug.
Later, on the same page (p131):
Before you start coding, it’s a good idea to sit down and think about your problem.
Both of these pieces of advice still apply. Neither has been universally internalised 24 years later.
