It's easier to test short focused methods than longer ones, because it's easier to set up the environment for testing (I suppose this is related to coupling) when you have fewer dependencies.
On another note: If you ever had a conversation with a person whose cognitive style and abilities are different from yours you'll know just how different people think about and solve problems. As an example in a typical discussion I cannot keep more than three of the opponents arguments in my head at the same time. This has lead my friends to carefully tailor their style of arguing so they get the three most important arguments in first (or last depending on if I'm in FIFO or LIFO mode :-) knowing that the rest will be discarded. That is a clear example of discrepancy in cognitive abilities.
A bunch of subroutines pose the same problem for me, while the layering and general spatial metaphors of OO saves the day.
Some people probably have a cognitive style more suited to procedural thinking, which means we might not be able to agree on optimum length or paradigm.
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