One of the more visible applications of ergonomics has been to computer software. When "user-friendly" software was first sold, many programs had single stroke "delete" or "erase" commands. Because of this, many a computer operator has contemplated suicide when he has inadvertently erased an entire data file or program. One wrong keystroke and it was all over.

However, most contemporary software requires at least a two-step keystroke sequence to initiate a delete or erase command. By incorporating a two-step sequence, it ensures that no mistake is being made. While the operator might hit a single keystroke by mistake, the operator would not hit two or perhaps even three specific keystrokes in an ordered sequence unless he really means to activate that particular command. In this way, inadvertent or random mistakes are greatly reduced.

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