If it sounds simplistic that’s because it is. But just because it’s simple doesn’t mean it’s not important.
Think about it. If you’re in a good mood and someone asks you for something, aren’t you more inclined to grant the favor? That’s just human nature, and your boss is no different. So before you ask for a raise, gauge your boss. Is he ecstatic over a recent big win? Did he just get a promotion or accolades himself? Is his team well on their way to meeting goal and garnering him a bonus?
If things are going well for the decision-makers, the decision on your raise stands a much better chance of going your way.