How to draw use case diagram?

If the requirements specification contains functional requirements for the system, ask yourself the following Questions

-> What are the primary tasks that the actor wants the system to perform ?

-> Will the actor create, store, modify, remove or read data from the system?

-> Will the actor need to inform the system about sudden external changes ?

-> Does the actor need to be informed of certain events in the system ?

The answers to the above questions represent the flow of events that identify the use case candidates.

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Explain more elaborately ………further ………….

Applying Requirements Management with Use Cases

Requirements have many sources. They may come from anyone with an interest in the outcome of the project. Customers, partners, end users, and domain experts are some sources of requirements; so too are management, project team members, business policies, and regulatory agencies.

It is important to know how to determine who the sources should be, how to get access to those sources, and how to elicit information from them. The individuals who serve as primary sources for this information are referred to as “stakeholders” in the project. If you are developing an information system to be used internally within your company, you may include people with end-user experience and business domain expertise in your development team.

Very often you will start the discussions at a business-model level rather than at a system level. If you are developing a product to be sold to a marketplace, you may make extensive use of your marketing people to better understand the needs of customers in that market.

You can draw use case diagram in many ways such as powerpoint presentation, MS Visio, or even online with some resources.

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What are the elements of a Use Case diagram ? (Components):

Use Case diagram contains

  • Use Case Name
  • Iteration
  • Summary
  • Preconditions
  • Triggers
  • Basic course of events
  • Alternative paths
  • Post conditions
  • Business rules
  • Notes
  • Author and date


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