Why not just use a diary, or a time manager, or an electronic organiser?
Diaries are great for scheduling appointments. But if you write your information in your diary you will probably run out of space on those days when you have a lot to write down, you probably won’t refer back to something once you pass a page, you won’t be able to quickly retrieve information when you need it, and you won’t have any system for cross-checking your work. Diaries just don’t have the functionality of Daybooks and they were never meant to. Electronic organisers are great as information storehouses, but they are still impractical in many ways: you can’t just quickly scribble a note to yourself in one; you can’t see at a glance where you stand with your work in general or on a particular project; they are not easy to use in meetings without distracting others; and you still don’t have any system to cross check that everything you set out to do gets done. It is also not financially viable to give an electronic organiser to everyone in an organisation. Time managers can certain