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“there are still a few administrative i's to dot and t's to cross”

From here there is a sentence:

If you fail to dot an “I” or cross a “T,” you could be banging your head against the wall for hours.

What does the author mean by dot an "I" or cross a "T"?

Thanks.

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marked as duplicate by RegDwigнt Apr 8 '12 at 19:58

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It's actually a lower case i that gets dotted, if that helps in your understanding. As Barrie explains, it means taking care of the minutest of details, like the dots on the "i"s and the crosses on the "t"s. –  JLG Apr 8 '12 at 19:30
    
Related: the advice (to Americans) to be very careful in filling out their (federal) income tax forms, because "the IRS will drive a Sherman tank through a pin-hole". –  Hexagon Tiling Apr 8 '12 at 21:25

1 Answer 1

up vote 1 down vote accepted

It means to be meticulously accurate in what you are doing.

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