Splitting phases like this is common in large software; the various phases in a compiler can each contain many functions and classes. But I can carry out the basic split-phase refactoring on any fragment of code—whenever I see an opportunity to usefully separate the code into different phases. The best clue is when different stages of the fragment use different sets of data and functions. By turning them into separate modules I can make this difference explicit, revealing the difference in the code.
