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How to write use cases
 

How to write use cases

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A quick start How to write use cases.

A quick start How to write use cases.

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    How to write use cases How to write use cases Presentation Transcript

    • Writing Requirements the Use-Case Way Gloria Stoilova Senior Product Manager
    • What can go wrong in a product?  Rich in Features – yes, even too rich...  Poor in presentation – boring...  Interface Not intuitively designed – (developers do not have sense of design)  Usability issues – it’s all about the client, isn’t it? Examples:
    • Appeal  Do not ever compromise at requirements stage  Be Aggressive in specifying User Requirements (we are not stating our requirements)  Always have the user in mind  Don’t get tied down by technology alone. Technology is changing fast.
    • Need for Change Increased competition New Technologies changing systems user should be thrilled and excited and not just satisfied Plan for on-line usage not off-line usage Think differently Do things differently
    • Collecting User Requirements 1st - Identify users. 2nd - Identify their roles, responsibilities and needs. 3rd - Asking users is not enough - observing user in action only can give complete picture of what he needs. 4th - User - Task Analysis. 5th - Define Problem Statements.
    • Use Case Model  Use-Case Model is a model of the system’s intended functions (use cases) and its surroundings (Actors).  The same use-case model is used in requirements analysis, design and test.  The use case model’s primary purpose is to communicate the system’s functionality and behavior to the customer or end user.
    • THE Actor  An actor represents anything that interacts with the system.  Actors are not part of the system, they represent roles a user of the system can play.  An actor may actively interchange information with the system.
    • THE Actor  An actor may be a passive recipient of information.  An actor can represent a human, a machine or another system.
    • Finding Actors: useful questions  Who is interested in a certain requirement?  Where in the organization is the system used?  Who will supply the system with the information, use this information, remove this information?  Who will use this function?
    • Finding Actors: more useful questions  Does the system use an external resource?  What actors do the use cases need?  Does one actor play several different roles?  Do several actors play the same role?
    • Use Cases  The use case model is a dialogue between actors and the system.  The use case is initiated by an actor to invoke a certain functionality in the system.  The use case is a complete and meaningful flow of events.  Taken together, all use cases constitute all possible ways of using the system.
    • Finding Use Cases: Useful Questions  What are the tasks of the actor?  Will the actor create, store, change, remove or read information in the system?  What use case will create, store, change, remove, or read, this information?  Will the actor need to inform the system about sudden, external changes?
    • Finding Use Cases: Useful Questions  Does the actor need to be informed about certain occurrences in the system?  Does the system supply the business with the correct behavior?  What use cases will support and maintain the system?  Can all functional requirements be performed by the use cases?
    • Who Reads Use-Case Documentation?  Customers - approve what the system should do.  Users - gain system understanding.  System developers- document system behavior.  Reviewers - examine the flow of events.
    • Who Reads Use-Case Documentation?  System analysts (designer) - provide the basis for analysis and design.  System Tester - used as a base for test cases.  Project Leader - provide input to project planning.  Technical Writer - Basis for writing the user’s guide.
    • Example: Time Tracking System  User will create a task.  User will update the task status by entering the efforts spent against each task, for each date.  Actors are not identified.  Talks from system Perspective.
    • Example: Use Case Approach  Actors: Team Managers, Team Members, Department Heads.  Team Managers will use the system to assign a task to subordinate.
    • Use Case Model (Continued)  Team Member will view the task and update the task status by specifying the details of the task execution.  Department head will access the system to view projects status in his domain.
    • Summary and Suggestions  Always identify Actors.  Prepare Actor - Attributes, Profiles, Responsibilities…  Identify Goals of each Actor.  Arrive at Actor - Tasks, sub-tasks, KPIs,
    • Summary and Suggestions  While specifying requirements use Actor names.  Make used language “User Oriented” in all concept documents and requirements.  It is not necessary to use tools alone to document use-cases.  It is the language used that is going to make the difference.
    • Thank you for your attention! Good Luck with your project…. gloria.stoilova@gmail.com