Cook's executive changes occurred after the third quarter of the fiscal year (Q3), when revenues and profits grew less than predicted. One commentator said that Forstall was forced to step down, as Cook "decided to lance the boil as internal politics and dissent reached a key pitch". Since becoming CEO, Cook focused upon building a harmonious culture that meant "weeding out people with disagreeable personalities—people Jobs tolerated and even held close, like Forstall" although, another journalist said that "Apple's ability to innovate came from tension and disagreement.