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ICT doubt...please help!

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look this is an extra digit added at the end of a product bar code number or the ISBN number of a book to check the validity of the data and it will be calculated from the original number
 
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look this is an extra digit added at the end of a product bar code number or the ISBN number of a book to check the validity of the data and it will be calculated from the original number
Thank you so much for that! Perhaps a little insight on how exactly it works and helps?
There was a question in a past paper but the mark scheme was vague...
 
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PLEASE I WANT ANYONE TO GV ME THE BEST 6 points to lear for expert system (clear points) and what do u expect...I was hving AS exams so didnt prepare well so anybody please..I LL BE SO THANKFUL!
 
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Expert system
- A list of questions appears on the user interface/screen
- The user types in the answers for those questions
- The inference engine matches the answers with the knowledge base using rules base
- The system suggests a possible diagnosis
- The system suggests probabilities that it is correct

that was from my head... so might be wrong :p
 
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