This is where your advisor can play a big role. If you've really made your analysis as simple as possible, it is a) less likely to contain an error, and b) any errors that remain will be easier to nd. This brings me to another common problem. When you've worked on a topic for several months|or even several weeks|you tend to lose a lot of perspective : : : literally. You're just too close to the work to really get a picture of what is going on. This lack of perspective takes one of two forms: rst, you may think something is obvious when it really.