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In the coming tutorials, I plan to introduce Cocoa Bindings and contrast it with the ‘traditional’ outlet/action approach to app development. But in order to understand how Bindings work, you first need to know about the underlying Cocoa technologies, namely, Key-Value Coding (KVC) and Key-Value Observing (KVO). In this short tutorial, I will introduce you to the marvels of keys and key paths, which underpin much of the Cocoa coolness. Next time, I will take a look at Key-Value Observing.