Marcel Weiher: Bindings are one-way dataflow constraints, specifically with the equation limited to y = x1. More complex equations can be obtained by using NSValueTransformers. KVO is more of an implicit invocation mechanism that is used primarily to build ad-hoc dataflow constraints. […] Anyway, when you add it all up, my conclusion is that while … Continue reading The Siren Call of KVO and (Cocoa) Bindings