If you’re sometimes frustrated about how little you accomplish during your work day, you’re not alone. Research indicates that only 26% of people often leave the office having accomplished the tasks they set out to do. It’s common to feel as if you’ve been busy but haven’t done anything important. Of course, life isn’t about being a productivity robot in which every second is optimized. But most of us do want to feel well-organized and efficient in pursuing key goals and solving critical problems. A good first step is to understand the mental mistakes that typically prevent us from focusing on and finishing meaningful work.  Here are five common ones: