What problems did you run into and what would you do differently in the future? Are there any ethical concerns in your research study? Are there elements of your study which you wish were stronger? The best researchers are able to critically evaluate their own work. It is not acceptable (even for the best researchers in the world) to claim that their research is perfect. Points are awarded here for your ability to find your own shortcomings. Your grade will suffer if you claim to have done everything perfectly. No researcher EVER does it perfectly.