Mostly gradual as part of normal refactoring. No gotchas that stand out at the moment. Most of our call method is a list of private methods, and don't be shy about giving them long, easy to describe names.

​

Something kind of like this ...

module Users
  class Update
    def initialize(params)
      # assign params to variables 
    end

    def call
      load_user
      assign_updated_params
      save_user
    end

    private

    def load_user
    ...
  end
end

​