際際滷

際際滷Share a Scribd company logo

Functional modeling

?Download as PPT, PDF?
?
Fatma Al-sayegh
Fatma Al-sayegh

The document discusses functional modeling using activity diagrams and use cases. It provides guidelines for creating activity diagrams and use cases, including identifying activities, control flows, decisions, and parallel processes for activity diagrams. It also discusses writing use case descriptions in SVDPI form from an observer perspective and creating use case diagrams by connecting actors to use cases. The overall purpose is to understand and create functional models to document requirements and describe business processes.

1 of 31
Functional Modeling FATMA AL-SAYEGH
Objectives ＊Understand the rules and style guidelines for activity diagrams. ＊Understand the rules and style guidelines for use cases and use case diagrams. ＊Understand the process used to create use cases and use case diagrams. ＊Be able to create functional models using activity diagrams, use cases, and use case diagrams. 際際滷 2
Functional models ?Used to document and understand requirements ?Describe business processes and interaction with environment ?Used for both as-is and to-be systems ?Two types: activity diagrams and use cases. 際際滷 3
Functional models ?Both activity diagrams and use cases are logical models describe the activities of a system without specifying how the activities are implemented ?Focus on how business runs instead of implementation details 際際滷 4
Business Process Modeling with Activity Diagrams ELEMENTS OF AN ACTIVITY DIAGRAM GUIDELINES FOR CREATING ACTIVITY DIAGRAMS 際際滷 5
Activity Diagrams ?Used for any process modeling activity, esp. business process modeling ?Process models show how a business system operates ?Processes/activities performed ?How objects/data move 際際滷 6
BPM With Activity Diagrams ?A number of activities support a business process across several departments ?Activity diagrams model the behavior in a business process ?Sophisticated data flow diagrams ?Addresses Parallel concurrent activities and complex processes 際際滷 7
Activity Diagram syntax 際際滷 8
Activity Diagram syntax 際際滷 9
Activity Diagram Example 際際滷 10
Activity Diagram Example 際際滷 11
Creating Activity Diagrams 1.Since an activity diagram can be used to model any kind of process ,you should set the context or scope of the activity being model. Once you have determined the scope, you should give the diagram an appropriate title. 2.You must identify the activities, control flows, and object flows that occur between the activities. 3.You should identify any decisions that are part of the process being modeled. 4.You should attempt to identify any prospects for parallelism in the process. 5.You should draw the activity diagram 際際滷 12
USE-CASE DESCRIPTIONS 際際滷 13
Use Cases ?Formal way of representing how system interacts with its environment. ?Illustrates the activities that are performed by users of a system ?Provide external or functional view of a process, not internal mechanism. 際際滷 14
What are Use-Case Descriptions? ?Describe basic functions of the system ?What the user can do ?How the system responds ?Use cases are building blocks for continued design activities. 際際滷 15
How Are Use-Cases Created? ?Two steps: ?Write text-based case descriptions ?Translate descriptions into diagrams ?Describes one and only one function, but may have multiple paths. 際際滷 16
Use Case Description Example 際際滷 17
Guidelines for Creating Use-Case Descriptions 際際滷 18 ?Write each step in ＾SVDPI￣ form ?Clarify initiator and receivers of action ?Write from independent observer perspective ?Write at same level of abstraction ?Ensure a sensible set of steps ?Apply KISS principle liberally ?Write repeating instructions after the set of steps to be repeated.
USE-CASE DIAGRAMS 際際滷 19
Syntax for Use-Case Diagram 際際滷 20
The Use-Case Diagram for Appointment System 際際滷 21
Use-Case Diagram with Specialized Actor 際際滷 22
Extend and Include Relationships 際際滷 23
CREATING USE- CASE DESCRIPTIONS AND USE-CASE DIAGRAMS 際際滷 24
Identifying the Major Use- Cases ?Review the activity diagram ?Identify the system¨s boundaries ?List the primary actors ?List the goals of each primary actor ?Identify and write the major use- cases ?Carefully review and revise use- cases 際際滷 25
Expand the Major Use- Cases ?Choose one major use-case to expand ?Fill in details on the use-case template ?Fill in the steps of the normal flow of events ?Normalize the size of each step ?Describe alternate or exceptional flows ?Simplify and organize as necessary 際際滷 26
Confirm the Major Use Cases ?Review the current set ?Consider semantics and syntax ?Helpful to involve the users ?Iterate the entire set of steps until all use cases are defined 際際滷 27
Create the Use-Case Diagram ?Start with system boundary ?Place elements in order to be easy to read ?Place actors on the diagram ?Conclude by connecting actors to use cases by lines. 際際滷 28
Writing Effective Use-Case Descriptions 際際滷 29
Expanding the Domain ?Additional resources regarding use-cases and many other object-oriented development topics can be found at: ?: . .http //www omg org 際際滷 30
Summary ?Use-case descriptions are the basis for further analysis and design. ?Use-case diagrams present a graphical overview of the main functionality of a system. 際際滷 31

More Related Content

Functional modeling

  • 2. Objectives ＊Understand the rules and style guidelines for activity diagrams. ＊Understand the rules and style guidelines for use cases and use case diagrams. ＊Understand the process used to create use cases and use case diagrams. ＊Be able to create functional models using activity diagrams, use cases, and use case diagrams. 際際滷 2
  • 3. Functional models ?Used to document and understand requirements ?Describe business processes and interaction with environment ?Used for both as-is and to-be systems ?Two types: activity diagrams and use cases. 際際滷 3
  • 4. Functional models ?Both activity diagrams and use cases are logical models describe the activities of a system without specifying how the activities are implemented ?Focus on how business runs instead of implementation details 際際滷 4
  • 5. Business Process Modeling with Activity Diagrams ELEMENTS OF AN ACTIVITY DIAGRAM GUIDELINES FOR CREATING ACTIVITY DIAGRAMS 際際滷 5
  • 6. Activity Diagrams ?Used for any process modeling activity, esp. business process modeling ?Process models show how a business system operates ?Processes/activities performed ?How objects/data move 際際滷 6
  • 7. BPM With Activity Diagrams ?A number of activities support a business process across several departments ?Activity diagrams model the behavior in a business process ?Sophisticated data flow diagrams ?Addresses Parallel concurrent activities and complex processes 際際滷 7
  • 11. Activity Diagram Example 際際滷 11
  • 12. Creating Activity Diagrams 1.Since an activity diagram can be used to model any kind of process ,you should set the context or scope of the activity being model. Once you have determined the scope, you should give the diagram an appropriate title. 2.You must identify the activities, control flows, and object flows that occur between the activities. 3.You should identify any decisions that are part of the process being modeled. 4.You should attempt to identify any prospects for parallelism in the process. 5.You should draw the activity diagram 際際滷 12
  • 14. Use Cases ?Formal way of representing how system interacts with its environment. ?Illustrates the activities that are performed by users of a system ?Provide external or functional view of a process, not internal mechanism. 際際滷 14
  • 15. What are Use-Case Descriptions? ?Describe basic functions of the system ?What the user can do ?How the system responds ?Use cases are building blocks for continued design activities. 際際滷 15
  • 16. How Are Use-Cases Created? ?Two steps: ?Write text-based case descriptions ?Translate descriptions into diagrams ?Describes one and only one function, but may have multiple paths. 際際滷 16
  • 17. Use Case Description Example 際際滷 17
  • 18. Guidelines for Creating Use-Case Descriptions 際際滷 18 ?Write each step in ＾SVDPI￣ form ?Clarify initiator and receivers of action ?Write from independent observer perspective ?Write at same level of abstraction ?Ensure a sensible set of steps ?Apply KISS principle liberally ?Write repeating instructions after the set of steps to be repeated.
  • 20. Syntax for Use-Case Diagram 際際滷 20
  • 21. The Use-Case Diagram for Appointment System 際際滷 21
  • 22. Use-Case Diagram with Specialized Actor 際際滷 22
  • 23. Extend and Include Relationships 際際滷 23
  • 25. Identifying the Major Use- Cases ?Review the activity diagram ?Identify the system¨s boundaries ?List the primary actors ?List the goals of each primary actor ?Identify and write the major use- cases ?Carefully review and revise use- cases 際際滷 25
  • 26. Expand the Major Use- Cases ?Choose one major use-case to expand ?Fill in details on the use-case template ?Fill in the steps of the normal flow of events ?Normalize the size of each step ?Describe alternate or exceptional flows ?Simplify and organize as necessary 際際滷 26
  • 27. Confirm the Major Use Cases ?Review the current set ?Consider semantics and syntax ?Helpful to involve the users ?Iterate the entire set of steps until all use cases are defined 際際滷 27
  • 28. Create the Use-Case Diagram ?Start with system boundary ?Place elements in order to be easy to read ?Place actors on the diagram ?Conclude by connecting actors to use cases by lines. 際際滷 28
  • 30. Expanding the Domain ?Additional resources regarding use-cases and many other object-oriented development topics can be found at: ?: . .http //www omg org 際際滷 30
  • 31. Summary ?Use-case descriptions are the basis for further analysis and design. ?Use-case diagrams present a graphical overview of the main functionality of a system. 際際滷 31