Project planning is all about figuring out when we are going to finish our project and how much is it going to cost. We typically start with a fixed start date and then figure out what the end date and associated cost may be.Why then, when planning our day to day lives do the very opposite and reverse engineer the plan in order to achieve our goals? For example, “if I need to be at work by 9am , I probably need to leave the house by say 7.30am” or “in order to get my Christmas cards delivered on time, I should make sure they are in the mail no later than say the 10th December”.