>There was (and maybe still is) a similar method commonly used for
>handling data entry years ago.  You'd get two people to type something
>in, then run a diff on it.  A third person then went thru & cleaned up
>the errors.  To increase accuracy you'd have more typists, as two
>people may make the same error.

The Inforex key to disk capture systems we used to use did that. First 
operator would key a batch in, and it got loaded to disk. Second operator 
keyed same batch and it compares to first operator input. I don't know how 
it flagged differences or resolved them. It was a pretty early system and 
had minimal smarts, so I guess it printed out and it was manually resolved. 

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