System Sequence Diagrams (SSDs) Overview
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Questions and Answers

What do system sequence diagrams (SSDs) primarily illustrate?

  • Software development life cycle phases.
  • The detailed internal workings of the system.
  • The flow of data within a database.
  • Input and output events for a specific scenario of a use case. (correct)

    • When identifying input messages in developing an SSD, what notation should be used?

  • Verb-noun format indicating system requests. (correct)
  • Descriptive sentences outlining intent.
  • Parameter-value pairs.
  • Name-verb with a singular form.

    • What is the role of system operations in the context of SSDs?

  • They limit the number of messages that can be sent to the system.
  • They represent low-level operations performed by external actors.
  • They directly manipulate the database and system architecture.
  • They provide a public interface of high-level operations triggered by input events. (correct)

    • Which special conditions might be considered for input messages in SSD development?

    <p>Iteration/loop frames and conditional frames. (A)</p> Signup and view all the answers

    What is a key characteristic of how the system is treated within a system sequence diagram?

    <p>Primarily as a black-box component. (C)</p> Signup and view all the answers

    Flashcards

    SSD Input Message

    A message from an external actor, describing the action required by the system, including the necessary parameters.

    SSD Special Input Conditions

    Conditions like loops (iteration/loop frame) or optional actions (opt/alt frame) that affect input messages.

    SSD Output Return Values

    Explicit or implicit values the system returns to the external actor after processing the input message(s).

    System Sequence Diagram (SSD)

    A diagram showing the order and events related to a specific use case scenario, from the external actor to the system as a black box.

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    System Operation

    High-level operation offered by the system in response to an external event or input message.

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    Study Notes

    Steps for Developing SSDs

    • Identify input message: Analyze activity flow or diagrams to understand input messages.
    • Describe the message: Describe the message from external actors using verb-noun notation.
      • Specify parameters the system needs.
    • Identify special conditions: Look for iteration/loop frames, optional/alternative frames, and special conditions for input messages.
    • Identify output return values: Determine return values, whether explicit on separate lines or a message's attribute.

    System Sequence Diagrams (SSDs)

    • Illustrate input and output events: SSDs visually represent input and output sequences for a use case scenario.
    • One use-case scenario: SSDs focus on a specific scenario within a use case.
    • External actor events: Diagrams depict events from external actors (generating events), their sequence, and inter-system events.
    • System as black box: The system is treated as a black box, focusing on interactions rather than internal workings.
    • Use case derivation: SSDs are created from use cases and often focus on successful scenarios, frequent occurrences, or complex alternatives.
    • Input for object design: SSDs serve as input to object design.

    System Events and Operations

    • System operations: Represent the system's public interface operations triggered by external events or system events.
    • High-level operations: System operations are high-level, acting as a black box.
    • External actor triggers: System operations are initiated by external actors.
    • Conceptual class assignment: Operations are assigned to a conceptual "System" class during behavior analysis.
    • Parameter omission: In certain examples when messages have no parameters, the notation omits them. This is not always the case, though.

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    Related Documents

    ITM305 Week 7 SSD Development Steps PDF

    Description

    Explore the key steps involved in developing System Sequence Diagrams (SSDs) through a structured approach. This quiz covers identifying input messages, describing messages, and illustrating input and output events from external actors. Gain insight into how SSDs represent use case scenarios effectively.

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