To achieve a critical mass, it is crucial to distinguish clearly between three types of notes: 1. Fleeting notes, which are only reminders of information, can be written in any kind of way and will end up in the trash within a day or two. 2. Permanent notes, which will never be thrown away and contain the necessary information in themselves in a permanently understandable way. They are always stored in the same way in the same place, either in the reference system or, written as if for print, in the slip-box. 3. Project notes, which are only relevant to one particular project. They are kept
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