A lot of people I know and come into contact with on a daily basis have no form of time management system. For them, the age old system of maintaining a hazy list of things to do in their head and trying to complete the list as best they can is the only way to it. While this might work for someone's slow, lazy day, it can become a dangerous, time wasting behavior when things really need done. Trying to recall everything that needs done every day and re-remembering what has already been done takes a lot of unnecessary time! It's hard to remember everything about as many as 20 different things you need to do. Do you remember exactly what you were doing five, ten, or twenty hours ago? Can you list off everything you've gotten don in the last ten hours? It's tough! Even if you have a strong hold on that information, you're mind will still spend precious hours of time subconsciously wrestling with the list, going over it time and time again, making sure you know what has and hasn't been done, trying to think of every little thing that needs to be done that you might have forgotten, or everything little thing that you thought of before but have now forgotten, or…!
How can you concentrate and get anything done with THAT going on in your head?