Central premise II

• Changing an implementation is the best change, since it’s isolated

• This may not always be true

  • Changing a local implementation may not be easy
  • Some global changes are straightforward
    • Mechanically or systematically
  • VanHilst and Notkin have an alternative
    • Using parameterized classes with a deferred supertype [ISOTAS, FSE, OOPSLA]
  • Griswold’d new work on information transparency

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