• Concurrent Versus Non-Concurrent Operations

• Operation Dependencies

• KVO-Compliant Properties

• Threading Considerations

• Subclassing Notes

• Methods to Override

• Responding to the Cancel Command

• Initialization

• Executing the Operation

• Canceling Operations

• Getting the Operation Status

• Managing Dependencies

• Prioritizing Operations in an Operation Queue

• addDependency:

• cancel

• dependencies

• init

• isCancelled

• isConcurrent

• isExecuting

• isFinished

• isReady

• main

• queuePriority

• removeDependency:

• setQueuePriority:

• start

• NSOperationQueuePriority

• Operation Priorities