I observe this maybe the main reason: getting ready for one week is just too overwhelming. People can deal with long term goal setting and planning, and deal with short term planning and task prioritization. It is just more complex to see all those tidy details on each task. It is just overwhelmed by one week worth of tasks. Uncertainty is the other keyword here. Another simple reason it is just not in your calendar. Frankly if it is not in your calendar, you basically won’t do it. Why We Resist the Weekly Review and Plan (and What You Can Do About It) – [Ricky’s RAM Dump]