Introduction to Task-Centered System Design (TCSD)
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Introduction to Task-Centered System Design (TCSD)

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Questions and Answers

What percentage coverage is typically considered successful for user systems?

  • 80%
  • 70%
  • 95%
  • 90% (correct)

    • Which category should tasks fall into for user-centered requirements analysis?

  • Must include (correct)
  • Exclude (correct)
  • Controversial
  • Optional

    • During the design phase, what should a designer focus on when creating interface designs?

  • How to reduce user frustration
  • How designs tell a story (correct)
  • Minimizing development costs
  • Maximizing aesthetic appeal

    • What is the primary activity during the evaluation phase of user-centered design?

    <p>Performing task-centered walk-throughs</p> Signup and view all the answers

    What does the 'must include' category refer to in user-centered requirements?

    <p>Essential tasks that must be part of the system</p> Signup and view all the answers

    To achieve a 90% coverage in user-centered design, what proportion of tasks and users could potentially be excluded?

    <p>10%</p> Signup and view all the answers

    Which decision is usually considered the most difficult in user-centered requirements analysis?

    <p>Deciding which User Types to Include</p> Signup and view all the answers

    What is a key requirement for developing good task descriptions?

    <p>Descriptions must be specific and concrete.</p> Signup and view all the answers

    Why is it important for the task description to flow through all aspects of the task?

    <p>To consider how interface features work together.</p> Signup and view all the answers

    Which rule emphasizes the importance of naming actual users in task descriptions?

    <p>Rule 4: Reflecting real user interests.</p> Signup and view all the answers

    What should good task descriptions identify alongside typical expected users?

    <p>Unusual users.</p> Signup and view all the answers

    What is the purpose of validating the task descriptions with end users or their representatives?

    <p>To get a reality check on task accuracy.</p> Signup and view all the answers

    What type of data should task descriptions provide for system requirements?

    <p>Concrete data reflecting user requirements.</p> Signup and view all the answers

    Why should task descriptions not include interface mechanics?

    <p>It ensures focus on user goals.</p> Signup and view all the answers

    What is one potential drawback of making task descriptions unnecessarily broad?

    <p>It limits the scope of user feedback.</p> Signup and view all the answers

    What is the primary focus of task-centered system design (TCSD)?

    <p>Understanding real-world tasks and users to inform system design</p> Signup and view all the answers

    Which is NOT one of the four phases of task-centered system design (TCSD)?

    <p>Feedback and Iteration</p> Signup and view all the answers

    What is the purpose of Phase I in the TCSD process?

    <p>To identify users and articulate their tasks</p> Signup and view all the answers

    What method is NOT used for discovering tasks in Phase 1?

    <p>Conducting surveys on market trends</p> Signup and view all the answers

    What is a key characteristic of good task descriptions in TCSD?

    <p>They should focus on what users want to do without dictating how</p> Signup and view all the answers

    Which approach is NOT part of discovering the tasks that users do?

    <p>Interviewing competitive product users</p> Signup and view all the answers

    What should the list produced in Phase I reflect?

    <p>A manageable list of representative users and their tasks</p> Signup and view all the answers

    Which of the following is an approach for validating task descriptions?

    <p>Getting feedback from actual users about the descriptions</p> Signup and view all the answers

    Study Notes

    Introduction to Task-Centered System Design (TCSD)

    • TCSD was introduced by Clayton Lewis and John Rieman in 1993
    • TCSD aims to make systems usable by focusing on real-world user tasks

    Phases of TCSD

    • Divided into 4 distinct phases:
      • Identification: Identifying users and their tasks
      • User-Centered Requirement Analysis: Deciding which users and tasks to include
      • Design Through Scenarios: Generating design possibilities based on user tasks
      • Evaluate Via Task-Centered Walk-Throughs: Evaluating the design by simulating user task scenarios

    Phase I: Identification

    • Goal: Produce a list of representative users and their tasks to ensure broad system coverage.
    • Steps:
      • Discovering the Tasks: Observe real users, conduct interviews, leverage end-user representatives, and incorporate internal beliefs.
      • Developing Good Task Descriptions: Write task descriptions adhering to 5 rules:
        • Focus on what users want to achieve rather than how they achieve it.
        • Be specific about user inputs and desired outputs.
        • Describe a complete task from beginning to end.
        • Reflect the real interests and information of the users.
        • Ensure task descriptions represent a broad range of users and task types.
      • Validating the Tasks: Get feedback from end users or representatives to confirm the accuracy of the task descriptions.

    Phase II: User-Centered Requirement Analysis

    • Goal: Determine which users and tasks will be covered by the system
    • User Type Inclusion:
      • Must Include: Critical users and tasks.
      • Should Include If Possible: Users and tasks that enhance the system's value.
      • Could Include: Users and tasks that are less essential but may be considered.
      • Exclude: Users and tasks that are not within the system's scope.
    • Task Inclusion: Follows a similar process to user type inclusion, balancing essential, desirable, and optional tasks.

    Phase III: Design Through Scenarios

    • Goal: Generate interface design possibilities that support user tasks.
    • Approach:
      • Each task description forms a scenario, with a user, a goal, and expected actions.
      • Design features should be interconnected to facilitate task completion.
      • Consider how information flows within the design to support the user's workflow.

    Phase IV: Evaluate Via Task-Centered Walk-Throughs

    • Goal: Evaluate the design by simulating real user interactions.
    • Approach:
      • Choose a scenario and walk through it step by step.
      • Simulate the user's actions and decisions.
      • Identify any usability issues or areas for improvement based on the walk-through.
      • Refine the design based on the evaluation findings.

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    Related Documents

    Lecture 4.ppt.pdf

    Description

    This quiz covers the fundamentals of Task-Centered System Design (TCSD), introduced by Clayton Lewis and John Rieman. Explore the four distinct phases of TCSD, including identification of users, requirement analysis, scenario-based design, and evaluation methods. Test your understanding of how TCSD enhances system usability by focusing on user tasks.

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