Please help me answer this question providing a detailed dis

Please help me answer this question, providing a detailed discussion of it/ main pointers to discuss. Thanks.

Discover ambiguities and/or omissions in the following statement of requirements for part of a ticket-issuing system: \"An automatic ticket issuing system sells rail tickets. Users select their destination and input a credit card and a personal identification number. The rail ticket is issued, und their credit card account is charged with its cost. When the user presses the start button, u menu display of potential destinations is activated along with a message to the user to select a destination. Once a destination has been selected, users are requested to input their credit card. Its validity is cheeked and the user is then requested to input a personal identifier. When the credit transaction has been validated, the ticket is issued.

Solution

ambiguities

1.application which issues ticket,anything about it is not told.

2.checking validity of a card:This point must be explained in detail with steps.It should not be told in general.If it is told in general,we will be unclear about how the validity is done.

3.more information about system which issues tickets must be given

4.For payment system takes only credit credit transaction.It must be able to take debit card and Internet banking transaction too.anything about this facilitiesis not told .It is ommited