There are few occasions where having high emotional intelligence (EQ) comes in handy more than when you disagree with your boss. But it's hardly the only one. Many of us would even happily trade off a few IQ points in exchange for some extra EQ. In fact, people with very high IQs but lower emotional intelligence may be more likely to upset their bosses by focusing too much on the logical side of an argument while ignoring the social and emotional dimensions.
In fact, the most effective approach to disagreeing with your manager should really be based on EQ rather than IQ. Unsurprisingly, research suggests that employees with higher emotional intelligence are generally more rewarding to deal with, which is why they're more often promoted than those who aren't. In a world that still bases so many crucial career decisions on a single subjective factor in the eyes of one's direct manager, likability often trumps ability and work ethic.
Via The Learning Factor