use cases
Use Case (UC) "Brew Coffee"
American coffee, drip coffee
| Short description | ||||
| UC describes the brewage of coffee using a coffee machine (percolator) Q-Coffee3000 | ||||
| Actor | ||||
| CM (Coffee Maker) = the person who makes the coffee | ||||
| Preconditions | ||||
| No fresh (drinkable) coffee is available The coffeepot is empty The coffee machine (percolator) is ready-to-operate Power Supply is available |
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| Main Flow (M) | ||||
| M1 | The CM fills water into the water tank (A1) | |||
| M2 | The CM opens the filter box and inserts a new filter (A2a, A2b) | |||
| M3 | he CM fills in roast and ground coffee into the filter and closes the filter box (A3) | |||
| M4 | The CM checks the correct position of the coffeepot => is the coffeepot located in the designated position? (A4) | |||
| M5 | The CM starts the coffee machine (percolator) (A5a) | |||
| M6 | The coffee machine (percolator) brews a fresh and drinkable coffee (A6a) | |||
| M7 | The UC ends | |||
| Alternate Flows (A) | ||||
| A1 | The water has been filled in already (M2) | |||
| A2 | a | A used filter is in the filter box - The CM removes the used filter. Repeat at (M2) |
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| A2 | b | A new filter has been inserted already. - Continue at (M3) | ||
| A3 | The roast and ground coffee has been filled in already into the new filter.
The CM closes the filter box. Continue at (M4) |
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| A4 | The coffeepot is not located on the designated position. The CM places the coffeepot on the designated position. Continue at (M5) |
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| A5 | a | The coffee machine (percolator) does not respond. The CM reads the manual and tries to solve the problem. | ||
| A5 | a | 1 | The CM cannot solve the problem. The CM stops the procedure and contacts the support. | |
| A5 | a | 2 | The CM solves the problem using the manual Continue at (M6) |
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| A6 | a | A power breakdown occurs. The CM waits until reactivation | ||
| A6 | a | 1 | The coffee has been cooled off in the meanwhile. The CM pours the coffee away Continue at (M1) |
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| A6 | a | 2 | he coffee machine (percolator) continues automatically.(M7) | |
| Post conditions | ||||
| A fresh and drinkable coffee is brewed. | ||||
| Constraints | ||||
| Coffee quantity: 1 spoonful coffee per Cup of water or at one’s discretion Water quantity: 1 cup per person (1 cup = see water tank marker) Maximal water quantity: water tank „max“-mark has to be considered The fresh brewed coffee has to be drinkable. The coffee temperature is between 50° und 70° C… |
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| Business Objects | ||||
| Coffee machine (percolator) Water tank Coffeepot Filter box Roast and ground coffee Fresh and drinkable coffee Coffee filter Water |
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| Reference documents | ||||
| Manual of coffee machine (percolator) Q-Coffee3000 Technical specification of coffee machine (percolator) Q-Coffee3000 |
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A Simple Use Case
Design: Manfred Beck
A-1010 Vienna, Austria | Parkring 10
Phone +43 (1) 516 33 3824 | Fax +43 (1) 516 33 3000
