It is thus more practical to work with trajectories. With a trajectory, we know where something is headed, but we cannot say—or we refrain from guessing—where it will end. Working with trajectories is an admission that we cannot foresee the unanticipated factors and developments that might influence the trajectory, accelerating it or perhaps instead derailing it entirely. In this sense, working with trajectories is a more humble and realistic way of facing the future. A trajectory is also far less fatalistic than a prediction. The latter asserts that this is where we will end up, whereas a trajectory shows where we might end up.