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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.

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