common technique is to have index cards with forty-three dividers or a system with forty-three folders or two accordion files. The forty-three divisions come from the sum of two numbers, thirty-one and twelve, corresponding to the maximum thirty-one days in a Gregorian or Julian month and the twelve months in a year. Using folders, items scheduled for the current month are placed within the appropriate daily folder. Items which need to be done in a future month are placed in the corresponding monthly folder. Every day, the current daily folder is emptied and placed at the back of the set. At the start of a new month, the items for that month are removed from the month folder and placed in the corresponding daily folders. Simple systems which involve many repetitive tasks over time tend to use and re-use index cards of an appropriate size, with more complex systems using expandable "accordion files", file folders, or even entire rooms full of filing cabinets. Modern systems are usually maintained in computerized databases or with simple tools such as a Unix "calendar" file, a Microsoft Outlook calendar, etc. See also Calendar Time management References External links "Back to Basics: The Tickler File" from LifeHack "How to Create and Use the 43 Folders System" video on YouTube Office equipment Stationery