Core Data NSManagedObject - tracking if attribute was changed?

Take a look at KVO (Key-Value Observing): Key-Value Observing Programming Guide . That's the standard way to do this in Cocoa, and is a fundamental technology that you need to understand to be a good Cocoa programmer.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.