 In larger institutional uses, a tickler file would be chronological, with one section for each year or day, sometimes encompassing more than a century in as much detail as appropriate (especially for dates far in the future).A more 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.