| 1 | Sample-Use-Case: Withdraw Money from ATM |
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| 2 | *********************************************************************** |
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| 3 | |
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| 4 | .. Description of a use case |
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| 5 | .. The description must be formulated as seen from system (not: actors) |
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| 6 | .. Describes those changes an (outside) actor can notice |
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| 7 | .. Short and abstract as possible, as long as necessary. |
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| 8 | .. Each use case must have at least one actor involved |
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| 9 | .. Each use case must have a trigger and a result |
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| 10 | |
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| 11 | |
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| 12 | Short Description |
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| 13 | ----------------------------------------------------------------------- |
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| 14 | |
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| 15 | An account holder is paid a requested amount of money and the account |
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| 16 | is charged this amount. |
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| 17 | |
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| 18 | |
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| 19 | Actor(s) |
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| 20 | ----------------------------------------------------------------------- |
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| 21 | |
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| 22 | Account holder, Accounting System |
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| 23 | |
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| 24 | |
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| 25 | Trigger(s) |
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| 26 | ----------------------------------------------------------------------- |
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| 27 | |
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| 28 | The account holder puts a debit card into the ATM slot. |
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| 29 | |
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| 30 | |
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| 31 | Result(s) |
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| 32 | ----------------------------------------------------------------------- |
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| 33 | |
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| 34 | The account holder got an amount of money. The account has been |
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| 35 | charged. The account holder got back the debit card. |
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| 36 | |
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| 37 | |
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| 38 | Incoming Data |
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| 39 | ----------------------------------------------------------------------- |
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| 40 | |
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| 41 | PIN, requested amount |
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| 42 | |
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| 43 | |
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| 44 | Outgoing Data |
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| 45 | ----------------------------------------------------------------------- |
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| 46 | |
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| 47 | Data leaving the system _during_ use case. Includes only data not |
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| 48 | existing any more after use-case has been finished. For instance |
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| 49 | screen messages, etc. |
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| 50 | |
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| 51 | |
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| 52 | Precondition(s) |
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| 53 | ----------------------------------------------------------------------- |
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| 54 | |
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| 55 | The ATM is ready to receive a debit card. |
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| 56 | |
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| 57 | |
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| 58 | Postcondition(s) |
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| 59 | ----------------------------------------------------------------------- |
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| 60 | |
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| 61 | The ATM is ready to receive a debit card. |
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| 62 | |
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| 63 | |
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| 64 | Invariant(s) |
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| 65 | ----------------------------------------------------------------------- |
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| 66 | |
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| 67 | |
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| 68 | |
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| 69 | |
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| 70 | Essential Steps |
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| 71 | ----------------------------------------------------------------------- |
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| 72 | |
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| 73 | * Authenticate account holder |
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| 74 | * Get requested amount |
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| 75 | * Check possibility to withdraw |
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| 76 | * Charge account |
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| 77 | * Pay amount |
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| 78 | |
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| 79 | |
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| 80 | Open Issues |
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| 81 | ----------------------------------------------------------------------- |
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| 82 | |
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| 83 | |
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| 84 | |
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| 85 | |
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| 86 | Remarks |
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| 87 | ----------------------------------------------------------------------- |
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| 88 | |
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| 89 | |
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| 90 | .. raw:: latex |
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| 91 | |
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| 92 | \pagebreak[4] |
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