Interesting...
Validation is the process of checking data to make sure it is 'reasonable' data.

The importance of validation in billing systems is highlighted by the event that occurred in Huddersfield in March 2003, when a person received an electricity bill...

... for £2,320,333,681,613

The bill was accompanied by a letter threatening to take him court if he did not pay in full!

 

 

The error was a result of the meter number being entered in the wrong field of the database...

...but simple validation rules should have found this!

 

 

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