If you think you’re under-performing at work, you’re probably right, because few individuals are 100% motivated throughout sustained periods at work. In fact, even if you think that you are performing to the best of your capabilities, you’re probably wrong, as there is generally little overlap between what people think of their performance, and how they actually perform. The truth is that most people don’t try their best after they’ve been on the job for more than six months. There are four common reasons for this: 1.) Poor fit 2.) Disengagement 3.) Organizational politics 4.) Personal circumstances.