In 1977, two psychologists, Daniel Kahneman and Amos Tversky, conducted a study to prove how easy it can be to underestimate how much time it will take to accomplish a task. They called it the “planning fallacy.” In this study, they found that humans have a tendency to disregard historical data when it comes to making predictions. Even though we may have done the same project before and it took us a certain amount of time, we think it will take us less time the next time we do it. In fact, we think it will take us half the time it will actually take.