Macworld The accumulated failures and humiliations that have dogged Siri in recent years have finally proved too much for Apple’s senior management, who have decided to oust John Giannandrea from his role as Siri boss.

Tech products get delayed all the time, but Apple's recent acknowledgment that the next generation of Siri is delayed -- with no timeline beyond "in the coming year" -- is uncharacteristic for the typically secretive company.

Apple Inc. is undergoing a rare shake-up of its executive ranks, aiming to get its artificial intelligence efforts back on track after months of delays and stumbles, according to people familiar with the situation.