- Extract method -> move block of code into a separate function
- Move method -> move function to class that uses it most, removing or delegating it in the old class
- Replace temp with query -> Replace a temporary variable with a query
- Form template method -> Get the steps of two similar subclasses into methods with the same signature (to reduce duplication)
- Replace type with state/strategy -> Replace type code with a state object
- Replace conditional with polymorphism -> Move each leg of the conditional to an overriding method in a subclass. Make the original method abstract.
- Self encapsulate field -> Using get and set methods to access variables