1. Misreading the question. Disregard for the precise wording of the question, or poor comprehension of its meaning, can waste hours of work. Avoid this occasional but catastrophic slip by making a habit of breaking down and studying the question before you begin.

2. Beginning too late. There is nothing worse than a desperate rush to meet a deadline, especially if hours of good research are to be squandered through poor execution. Plan your time in advance and save yourself from the horror.