REQUIREMENTS MODELING

REQUIREMENTS MODELING

1. JAD

   • Definition
     • It involves continuous interacting with the users and designers of the system in development.
     • Methodology system originally used for designing a computer-based system, but can be applied to any development process.
   • During JAD session, activities such as open discussion above system requirement, documentation and prototyping are being done
     • JAD produces requirements model
   • JAD team
     • JAD team organizes meetings with the objective to get accurate system requirement from the participants.
     • System analyst will collect data through discussion, asking question, taking notes and provide support to the team.
   • JAD Roles
     • JAD Project Leader
       • Develops agenda
       • Acts as facilitator
       • Lead as JAD session
     • Top Management
       • Provides enterprise-level authorization & support for the project
     • Manager
       • Project support to the project at department level
       • Understand how the project support business function and requirements
     • System Analyst
       • Provide technical assistance & resources (security,backup, hardware)
     • User
       • Provide overall requirement of the system (input, output)
   • Advantages & Disadvantages

2. RAD

   • Definition
     • Method of software development which heavily emphasizes rapid prototyping iterative delivery.
   • Created By
     • Introduced in 1991 in James Martin's book by the same name.
   • Method
     • Agile development method
   • Radical steps : Generally follow cyclical process
     • 1. planning requirements
     • 2. User design
     • 3. Rapid construction
     • 4. Cutover
   • Model Design
   • Most Crucial When Considering RAD Is The Right
     • Measurable Progress
     • Quickly generate productive code
     • Compartmentalization of system compenent
     • Rapid, constant user feedback
     • Early system integration
     • Simple adaptability
   • Advantages
     • It inherent synergy with the requirements of the medium itself software

3. AGILE (Fastest Method)

   • Advantages
     • Very flexible & efficient in dealing with change
     • Frequent deliverable constantly validate the project
     • Reduce risk
   • Develop System
     • Incrementally by build series of prototypes & adjusting them to users requirement regularly
   • Earlier Vision
     • Develop revise
     • Extend
       • Final Product
     • Merge
   • Emphasize
     • Continuous feedback
       • Incremental step
         • Prior step
   • Disadvantages
     • Team members higher level of technical & interpersonal skills
     • Lack of structure & documentation can introduce risk factor
     • Subject to significant change in scope
   • Scrum Framework

4. MODELING TOOLS & TECHNIQUES

   • Business Process Modeling (BPM)
     • Represents one or more business process.
       • Include shape & symbols
       • Use standard language
       • Business process diagram
   • Data Flow Diagram (DFD)
     • System stores, processes & transform data
     • The process
   • Use Case Diagrams
     • Represent the interaction between users and the system
     • Validation process of credit card
       • Users : customer
       • Process : valid / invalid
         • 1. Enter the credit card number & expiration date
         • 2. Verifies card
           • If valid = verify
           • If invalid = system reject
         • 3. TAC code
           • If valid = Receive message (code)
           • If invalid = no message
       • Precondition
         • Customer must select only 1 item
       • Post condition
         • Info has valid then customer can proceed with order
       • Assumption : none
   • Sequence Diagram

5. FACT FINDING

   • Interviews
   • Questionnaires
   • Document Review
   • Observation
   • Brainstorming

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