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Lesson 3, “Key Value Coding and Key Value Observing” covers why key value coding matters. First, viewers learn how to declare Key Value Coding (KVC) compliant properties. Next, viewers learn how to access the values in properties using key value coding. Following that, the lesson covers how to observe changes on objects using key value observing (KVO) and how to implement manual notifications. Finally, the lesson covers how to avoid common KVO gotchas.