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Contemporary Information Systems Development. Chapter 10. Chapter Objectives. Explain emerging approaches for collecting and structuring the information needed to design and construct an information system

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Presentation Transcript
chapter objectives
Chapter Objectives
  • Explain emerging approaches for collecting and structuring the information needed to design and construct an information system
  • Describe prototyping, rapid application development, and object-oriented analysis and design
  • Understand how and why to use several automated tools for supporting contemporary development
contemporary methods for collecting and structuring system requirements
Contemporary Methods for Collecting and Structuring System Requirements
  • Critical Success Factors (CSF)
  • Joint Application Requirements (JAR)/Joint Application Design (JAD)
critical success factors csf
Critical Success Factors (CSF)
  • Something that must go well to ensure success for a manager, department or company
  • How the CSF approach works
    • Select people from a cross-section of the major functional areas
    • Ask each person to define his or her own CSF
    • Merge personal CSF to create set of organization-wide CSF
strengths and weaknesses of the csf approach
Strengths

Understandable by senior managers

Provides structured process for collecting information needs of company

Weaknesses

Can lead to an over-simplification of a complex situation

Lack of availability of quality analysts to perform the CSF process

Not user-centered

Strengths and Weaknesses of the CSF Approach
joint application requirements jar joint application design jad
Joint Application Requirements (JAR)Joint Application Design (JAD)
  • Group-based methods for collecting requirements and creating designs
  • How the JAD approach works
    • Held in a conference room or a special-purpose JAD room
    • JAD expert facilitator helps group work effectively
    • Scribe records jointly agreed-upon design information
strengths and weaknesses of jad
Strengths

More people involved in the effort

Provides greater acceptance of new system

Training and support costs significantly lower

Weaknesses

Difficult to get all relevant users together

Inherent group process problems

Strengths and Weaknesses of JAD
contemporary approaches for designing and building systems
Contemporary Approaches for Designing and Building Systems
  • Prototyping
  • Rapid Application Development
  • Object-Oriented Analysis and Design
prototyping
Prototyping
  • Uses a “trial-and-error” approach
  • How Prototyping Works
    • Interview users of the system
    • Develop a prototype of the new system
    • Share with users
    • Users preview and ask for changes
    • Modify the prototype again; share with users
    • Continue process until users approve the system
strengths and weaknesses of prototyping
Strengths

Develops close working relationship between designer and users

Best method for systems with hard-to-define specifications

Works well with other development tools

Weaknesses

Not appropriate for every type of system

Sometimes rushes the development process

Strengths and Weaknesses of Prototyping
rapid application development rad
Four-phased methodology

Prototyping

Computer-based development tools

Special management practices

Close user involvement

How RAD works

Requirements planning

User design

Construction

Move to the new system

Rapid Application Development (RAD)
strengths and weaknesses of rapid application development
Strengths

Has active involvement of users

Produces a system in a fraction of the time normally needed

Weaknesses

Can limit systems in functionality and flexibility for change

May not be of highest quality

Strengths and Weaknesses of Rapid Application Development
object oriented analysis and design ooa d
Object-Oriented Analysis and Design (OOA&D)
  • Uses object-oriented languages (OOP) with reusable modules
  • How OOA&D works
    • Requirements broken down into smaller and smaller pieces called “modules”
    • Modules defined, programmed, and then pieced together to create the system
    • Has a tight coupling between data and the operations performed on them
strengths and weaknesses of ooa d
Strengths

Forces designers to integrate their thinking

Can improve quality

Can reduce development time

Objects can be reused by other systems

Weaknesses

Needs retraining of existing analysts and programmers

No research to support claim of higher quality or reduced time

Many programmers do not search for reusable code

Strengths and Weaknesses of OOA&D
tools for supporting contemporary systems development
Tools for Supporting Contemporary Systems Development
  • Computer Aided Software Engineering (CASE)
  • Group Support Systems
  • Advanced Programming Languages
computer aided software engineering case
Computer Aided Software Engineering (CASE)
  • Automated software tools used to develop information systems
  • Upper CASE
    • Used to automate the first three phases of SDLC
  • Lower CASE
    • Used to automate the last two phases of SDLC
general types of case tools
General Types of CASE Tools
  • Diagramming tools
  • Screen and report generators
  • Analysis tools
  • Repository
  • Documentation generators
  • Code generators
group support systems
Group Support Systems
  • GSS technology used to structure and coordinate group processes
  • GSS + JAD = Electronic JAD (E-JAD)
    • Using GSS software to support JAR / JAD activities
advanced programming languages
Advanced Programming Languages
  • Visual Programming
    • Allows developers to quickly build new user interfaces, reports, and other features
  • Object Oriented Programming (OOP)
    • Creates reusable objects
  • Fourth-Generation Languages and Beyond
    • Allows users to request information with easy to use syntax