System Sequence Diagrams Overview
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Questions and Answers

What is the primary purpose of the 'enterItem(itemId, quantity)' function in the process sale scenario?

  • To scan items for inventory management
  • To calculate the sales tax on items
  • To finalize the payment process
  • To register each item in the sale transaction (correct)

    • Which step in the process sale scenario directly involves customer interaction?

  • System presents total with taxes calculated
  • Cashier starts new sale
  • Customer pays and System handles payment (correct)
  • System records sale line item and presents item description

    • In a System Sequence Diagram, which element signifies a message sent from the Cashier to the System?

  • A cloud
  • An arrow (correct)
  • A rectangle
  • A dashed line

    • What is the outcome of the step where the system presents the total with taxes calculated?

    <p>The customer is informed of the total amount due (C)</p> Signup and view all the answers

    What is indicated by the term 'main success story' in the use case analysis?

    <p>The best-case scenario of the use case (C)</p> Signup and view all the answers

    Which function is responsible for recording the sale line item in the process sale scenario?

    <p>enterItem (C)</p> Signup and view all the answers

    Which step in the process sale scenario is optional and might not always yield a return value?

    <p>return value(s) (B)</p> Signup and view all the answers

    In the Process Sale Scenario, what is the first action the Cashier performs?

    <p>makeNewSale (B)</p> Signup and view all the answers

    What does the System provide after the Cashier completes the sale?

    <p>Total with taxes (C)</p> Signup and view all the answers

    Which UML notation is used to depict the interactions between the Cashier and the System in the Process Sale Scenario?

    <p>System sequence diagram (D)</p> Signup and view all the answers

    What is indicated by the 'loop [more items]' notation in the System Sequence Diagram?

    <p>Multiple items can be entered (C)</p> Signup and view all the answers

    Which of the following is a step performed by the System during the payment process?

    <p>MakePayment(amount) (C)</p> Signup and view all the answers

    Which component is NOT part of the Use Case Realizations?

    <p>Class definition (A)</p> Signup and view all the answers

    What is the primary role of the Cashier in the Process Sale Scenario?

    <p>Enter items and complete the sale (D)</p> Signup and view all the answers

    In UML, which type of diagram focuses on the workflow and steps taken during a specific process?

    <p>System sequence diagram (A)</p> Signup and view all the answers

    What aspect of UML is emphasized when discussing the ability to make design decisions?

    <p>Understanding fundamental object design skills (D)</p> Signup and view all the answers

    What is the primary purpose of a System Sequence Diagram (SSD)?

    <p>To illustrate events generated by external actors (B)</p> Signup and view all the answers

    Which of the following best describes how SSDs are derived?

    <p>From use cases (A)</p> Signup and view all the answers

    In UML notation for SSDs, what does the term 'makePayment(amount)' represent?

    <p>A high-level operation triggered by an external actor (A)</p> Signup and view all the answers

    What is indicated by the phrase 'System is treated as a black-box' in the context of SSDs?

    <p>Only the inputs and outputs of the system are considered (C)</p> Signup and view all the answers

    Which of the following best captures the interaction steps of the 'Process Sale Scenario'?

    <p>Cashier communicates totals after calculating taxes (A)</p> Signup and view all the answers

    Why are SSDs often drawn for main success scenarios and complex alternative scenarios specifically?

    <p>To ensure a comprehensive analysis of system behavior (C)</p> Signup and view all the answers

    What role does the 'Cashier' play in the SSD for the Process Sale Scenario?

    <p>An external actor generating input events (A)</p> Signup and view all the answers

    What is the significance of specifying intention in event naming, such as 'enterItem(itemId)'?

    <p>It provides clarity on the purpose of the event (A)</p> Signup and view all the answers

    Which of the following operations is typically performed right after a customer pays?

    <p>The system calculates change due (B)</p> Signup and view all the answers

    What does an asterisk (*) indicate in a System Sequence Diagram's message notation?

    <p>A repeating or looping of the message. (D)</p> Signup and view all the answers

    What is the significance of using brackets [] in the message notation for SSD?

    <p>It denotes a true/false condition for the message to be sent. (A)</p> Signup and view all the answers

    Which component is considered a high-level operation triggered by an external input event in SSD?

    <p>System operation (D)</p> Signup and view all the answers

    What does the notation 'return-value := message-name(parameter-list)' represent?

    <p>The capture of the return value from an outgoing message. (C)</p> Signup and view all the answers

    In UML message format, what is the purpose of having all names begin with a lowercase letter?

    <p>It maintains standardization for readability and clarity. (B)</p> Signup and view all the answers

    Which diagram types are included in the extending and integrating requirements models?

    <p>Use case diagram and system sequence diagram (A)</p> Signup and view all the answers

    What does the term 'message-name' in SSD indicate?

    <p>The identifier for the requested service, typically structured as a verb-noun. (A)</p> Signup and view all the answers

    What must every output in a System Sequence Diagram be derivable from?

    <p>The input to the use case combined with stored data. (D)</p> Signup and view all the answers

    What does the format 'message-name (parameter-list)' indicate in the UML message format?

    <p>The message name and any data needed for processing. (B)</p> Signup and view all the answers

    What does the notation '[true/false condition]' signify in a System Sequence Diagram?

    <p>It shows that the message will only be sent if the condition is true. (A)</p> Signup and view all the answers

    In the message notation for SSD, what does the '*' symbol represent?

    <p>The message indicates a loop or repetition. (C)</p> Signup and view all the answers

    Which of the following correctly describes a system operation in the context of a black box component?

    <p>High-level operations triggered by external input events. (B)</p> Signup and view all the answers

    What is the primary purpose of using parentheses in the parameter list in a UML message?

    <p>To indicate required parameters only. (C)</p> Signup and view all the answers

    In System Sequence Diagrams, what is the significance of a system's outputs?

    <p>Outputs must derive from both the input and stored data. (C)</p> Signup and view all the answers

    What is the role of the return-value in the message notation for SSD?

    <p>It describes data returned from the destination to the source. (A)</p> Signup and view all the answers

    What do domain classes in extending and integrating requirements models represent?

    <p>Components related to the conceptual model of the system. (C)</p> Signup and view all the answers

    Flashcards

    Process Sale Scenario

    A scenario describing how a cashier processes a sale; interacting with the system, entering items, calculating totals, and handling payment.

    enterItem(itemId, quantity)

    A message from a cashier to the system, specifying an item and quantity for a sale.

    makeNewSale

    An action initiated by the cashier to begin a new sale in the system.

    endSale

    The action to complete the sale process and finalize the transaction.

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    total with taxes

    The calculated sum of all items, including applicable taxes, in a sale.

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    makePayment(amount)

    The message from the cashier to the system, indicating the payment amount from the customer.

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    item identifier (itemId)

    A unique code identifying each item for sale.

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    System Sequence Diagram (SSD)

    A diagram that shows the events an external actor generates, their order, and inter-system events, treating the system as a black box.

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    System Operation

    High-level operations offered by the system in its public interface, triggered by external events.

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    External Actor

    A user or another system that interacts with the system.

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    Use Case

    A specific scenario of system use.

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    Process Sale Scenario (SSD)

    A System Sequence Diagram (SSD) example depicting the system's behavior in processing a sale.

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    Event (in SSD)

    An action or message that initiates or responds to system behavior, explicitly stating its purpose.

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    UML Sequence Diagram Notation

    Graphical notation used to depict message passing between actors and the system in SSDs.

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    Success Scenario

    A typical path for interacting with the system.

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    Conceptual Class System

    A high-level representation of the system that has system operations assigned.

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    Use Case Diagram

    A diagram visualising use cases and their actors (like the cashier) and their relationship to the system.

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    Use Case Realizations

    Connecting the use cases to the actual implementation of the system, showing how the system performs the expected functions.

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    UML Diagram

    A diagram used to visualize the design of a system, focusing on object interactions. It's about object design.

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    Domain Classes

    Concepts within a specific area of application or problem domain that are described using object-oriented designs.

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    Domain Model Class Diagram

    A diagram showcasing the objects and their relationships in a specific domain, like a POS system.

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    Activity Diagram

    A diagram that shows the sequence of activities in a process (like a sale).

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    SSD Message Format

    A standardized way to represent messages in System Sequence Diagrams (SSDs), including the message name, parameters, and return values.

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    Outgoing Messages (System Outputs)

    Messages sent from the system to outside actors, either as a response to an event or to request action and a reply.

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    Message Notation in SSD

    A specific format for messages on SSDs, using brackets for conditions, an asterisk for repetitions, and a colon to separate return values.

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    Study Notes

    System Sequence Diagrams

    • A system sequence diagram (SSD) shows the interaction between an actor and the system for a single use case.
    • It depicts the system as a black box.
    • It includes the initiating actor.
    • It includes any external systems that interact with the system.
    • It shows the messages exchanged between the actor and the system, and the order in which these messages occur.
    • It's a special type of UML sequence diagram.
    • It only shows the actor and one representing the entire system object.
    • It shows input and output messaging requirements for a use case.
    • It includes actor, system, and object lifelines.
    • It includes the messages.

    SSD Notation

    • Actors are represented by stick figures.
    • The system is represented by a rectangle labeled ":System".
    • Input messages from the actor to the system use arrows.
    • Return values from the system to the actor use arrows.
    • Lifelines represent the duration of the object's existence in the interaction.
    • Messages are named and may contain parameters.
    • Messages are written with verb-noun format.
    • Parameter lists are included in parentheses after the message name.
    • Empty parenthesis are used for no parameters.
    • An asterisk (*) indicates repeating or looping of messages.
    • Brackets ([ ]) denote true/false conditions. If the condition is true, the message is sent, otherwise it isn't.

    SSD Message Formats

    • Message names begin with lowercase letters.
    • Uppercase letters separate words within a name.
    • Parameter names are separated by commas.
    • An empty parenthesis () is used if there are no parameters.

    Outgoing Messages

    • Outgoing messages are responses of the system, completing an event.
    • They can also be messages from the system to and external system requesting action (and its reply).
    • Outputs must be derivable from the input to the use case combined with stored data.

    SSD Message Examples with Loop Frame

    • Detailed notation and alternate notation examples for scenarios involving loops, using input/output and conditional messaging (e.g., adding items to a list).

    Message Notation for SSD

    • The format for a message, showing conditional logic ([true/false condition]), return value, and parameters.
    • The asterisk(*) indicates repetition or looping of a message.
    • Brackets[] indicate true/false conditions.

    SSD Examples

    • Examples of the Opt frame (optional messages) and Alt frame (if-then-else) structures.
    • Complete examples of SSDs for use cases like creating a customer account or shipping items that use explicit return values (e.g., values returned/received at the end of the interaction).

    Steps in Developing an SSD

    • Steps for developing a system sequence diagram to identify input messages, special conditions, and output values.
    • The procedure focuses on defining the main success scenario and any loop or conditionality.

    SSD for Create Customer Account Use Case

    • Example showing the sequence of messages for the create customer account use case.
    • The messages show how the customer and the system interact.

    SSD for Ship Items Use Case

    • Example showing the sequence of messages for the ship items use case including loops for different item scenarios.

    System Events

    • System operations are high-level operations offered by the system in response to external input or system events.
    • System operations are assigned to a conceptual class System during system behavior analysis.
    • Include examples of messages without parameters.

    Example of an SSD for the Process Sale Scenario

    • This example shows how a sales scenario can be visualized using a system sequence diagram (SSD).
    • The example includes interactions between customer (user or cashier) and system, showing how messages are exchanged for different steps in a sales scenario (e.g., adding items, calculating total, completing the sale).
    • It demonstrates the use of loops to accommodate processing multiple items.

    Visualizing SSDs

    • The visualization methodology and a scenario illustration for a point of sale (POS) domain.

    "Complete" SSD for the Process Sale Scenario

    • A complete depiction of the detailed interactions between the system and the cashier (and customer), from the initial system response to the final exchange and receipt.

    Extending and Integrating Requirements Models

    • Use case diagrams and descriptions, activity diagrams, and system sequence diagrams are key models supporting requirements analysis.
    • These diagrams, along with domain class models (class diagrams) and use case realizations, are integrated and extended for comprehensive modeling.

    Integrating Requirements Models (Diagram)

    • A process diagram showing how use case descriptions, activity diagrams, and system sequence diagrams (SSDs) are connected to domain class models and use-case realizations in general.

    Drawing UML Diagrams

    • Drawing UML diagrams is a reflection of making design decisions.
    • The key is understanding the fundamental object design skills.

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    Related Documents

    Class Notes Week 7 PDF
    ITM305 Week 7 PDF

    Description

    This quiz explores the fundamentals of System Sequence Diagrams (SSD), detailing the interactions between actors and systems for specific use cases. It covers the notation used, including the representation of actors, the system, and the messages exchanged. Perfect for anyone looking to understand UML diagrams better.

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