[软件工程管理之用例]Use case

• Use Case ID: Satellite#1
• Use Case Name: Read the satellite input data
• Actor that initiates the use case:

–      Actor 1: Engineer

–      Actor 2: Programmer

• Other actors, if any: none
• Statement of the purpose of this use case:

        this use case allow the engineer input the satellite data into the system

• Preconditions (must be true before this use case can be “executed” ):

–      The engineer can login in the system and can input the data, can receive the successful return message

• Primary scenario (to describe the main action of the use case):

–      Open the main menu and click at “input data”

–      The system can return the successful message to the screen

• Post-conditions (what must be true after this use case “executes”):

–      The engineer can log out or return to main menu.

• Alternative scenarios (exception handling):

–      Give the engineer the warning message

• Comments: response time shall be less than 1 seconds.

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• Use Case ID: Satellite#2
• Use Case Name: Update satellite data
• Actor that initiates the use case:

–      Actor 1: Engineer

–      Actor 2: Programmer

• Other actors, if any: none
• Statement of the purpose of this use case:

        this use case allow the engineer update(change or delelte) the satellite data in the system

• Preconditions (must be true before this use case can be “executed” ):

–      The engineer can login in the system and can have the power to update the data, if the data have already updated then return a successful message

• Primary scenario (to describe the main action of the use case):

–      Open the main menu and click at “update data”

–      The system can return the successful message to the screen

• Post-conditions (what must be true after this use case “executes”):

–      The engineer can log out or return to main menu.

• Alternative scenarios (exception handling):

–      Give the engineer the warning message

• Comments: response time shall be less than 1 seconds.

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• Use Case ID: Satellite#3
• Use Case Name: Give warning for potential satellite collision
• Actor that initiates the use case:

–      Actor 1: The system

• Other actors, if any: none
• Statement of the purpose of this use case:

        this use case allow the system to give a warning message to the user for potential satellite collision

• Preconditions (must be true before this use case can be “executed” ):

–      The user can login in the system and have input the right satellite data, if there would a potential satellite collision then return a warning message

• Primary scenario (to describe the main action of the use case):

–      Open the main menu and input the satellite data

–      Click the “detect” button and the system will calculate the input data

–      The system can return the message to the screen, whether or not there would be a satellite collision

• Post-conditions (what must be true after this use case “executes”):

–      The user can log out or return to main menu.

• Alternative scenarios (exception handling):

–      The engineer test the system at regular intervals

• Comments: response time shall be less than 1 seconds.