Chapter01 the systems development environment

Copyright 2002 Prentice-Hall, Inc.
Chapter 1
The Systems Development
Environment
1.1
Modern Systems Analysis
and Design
Third Edition
Jeffrey A. Hoffer
Joey F. George
Joseph S. Valacich

Learning Objectives
Define information systems analysis
and design
Discuss the modern approach to
systems analysis and design
Describe the organizational roles
involved in information systems
development
1.2

Learning Objectives
Describe four types of information
systems:
 Transaction Processing Systems (TPS)
 Management Information Systems (MIS)
 Decision Support Systems (DSS)
 Expert Systems (ES)
Describe the information systems
development life cycle (SDLC)
1.3

Learning Objectives
Discuss alternatives to the systems
development life cycle
Discuss the role of computer-aided
software engineering (CASE) tools in
systems development
1.4

Introduction
Information Systems Analysis and
Design
 Complex process whereby computer-
based information systems are developed
and maintained
Application Software
 Result of systems analysis and design
 Designed to support specific organizational
functions or processes
1.5

Introduction
Software engineering processes have been
developed to assist in analysis and design
 Methodologies
 Comprehensive, multi-step approaches to systems
development
 Techniques
 Processes that are followed to ensure that work is well
thought-out, complete and comprehensible to others on
the project team
 Tools
 Computer programs to assist in application of techniques
to the analysis and design process
1.6

Introduction
Information Systems Analysis and Design
 A method used by companies to create and
maintain systems that perform basic business
functions
 Main goal is to improve employee efficiency by
applying software solutions to key business tasks
 A structured approach must be used in order to
ensure success
1.7

Introduction
Systems Analyst performs analysis and
design based upon:
 Understanding of organization’s objectives,
structure and processes
 Knowledge of how to exploit information
technology for advantage
1.8

Software Engineering Process
A process used to create an information
system
Consists of:
 Methodologies
 A sequence of step-by-step approaches that help
develop the information system
 Techniques
 Processes that the analyst follows to ensure thorough,
complete and comprehensive analysis and design
 Tools
 Computer programs that aid in applying techniques
1.11

Data and Processes
Three key components of an information
system
 Data
 Data Flows
 Processing Logic
Data vs. Information
 Data
 Raw facts
 Information
 Derived from data
 Organized in a manner that humans can
understand.1.10

Data and Processes
Data
 Understanding the source and use of data
is key to good system design
 Various techniques are used to describe
data and the relationship amongst data
Data Flows
 Groups of data that move and flow through
the system
1.11

Data and Processes
Data Flows (Continued)
 Include description of sources and
destination for each data flow
Processing Logic
 Describe steps that transform data and
events that trigger the steps
1.12

Approaches to Systems
Development
Process-Oriented Approach
 Focus is on flow, use and transformation of data in
an information system
 Involves creating graphical representations such
as data flow diagrams and charts
 Data are tracked from sources, through
intermediate steps and to final destinations
 Natural structure of data is not specified
 Disadvantage: data files are tied to specific
applications
1.13

Approaches to Systems
Development
Data-Oriented Approach
 Depicts ideal organization of data,
independent of where and how data are
used
 Data model describes kinds of data and
business relationships among the data
 Business rules depict how organization
captures and processes the data
1.14

Databases and Application
Independence
Database
 Shared collection of logically related data
 Organized to facilitate capture, storage and
retrieval by multiple users
 Centrally managed
 Designed around subjects
 Customers
 Suppliers
Application Independence
 Separation of data and definition of data from
applications
1.15

Organizational Responsibilities in
Systems Development
Systems Analysts work in teams
 Project Based
 Includes
 IS Manager
 Programmers
 Users
 Other specialists
 Characteristics of Successful Teams
 Diversity of backgrounds
 Tolerance of diversity
 Clear and complete communication
 Trust
 Mutual Respect
 Reward structure that promotes shared responsibility
1.16

Systems Development
IS Manager
 May have a direct role in systems
development if the project is small
 Typically involved in allocating resources to
and overseeing system development
projects.
Systems Analyst
 Key individuals in the systems
development process

Systems Development
Skills of a Successful Systems Analyst
 Analytical
 Understanding of organizations
 Problem solving skills
 System thinking
 Ability to see organizations and information systems as
systems
 Technical
 Understanding of potential and limitations of technology
 Management
 Ability to manage projects, resources, risk and change
 Interpersonal
 Effective written and oral communication skills
1.18

Systems Development
Programmers
 Convert specifications into instructions that
the computer understands
 Write documentation and testing programs
Business Managers
 Have power to fund projects and allocate
resources
 Set general requirements and constraints
for projects
1.19

Systems Development
Other IS Managers/Technicians
 Database Administrator
 Involved in design, development and maintenance of
databases
 Network and telecommunications experts
 Develop systems involving data and/or voice
communications
 Human Factors Specialists
 Involved in training users and writing documentation
 Internal Auditors
 Ensure that required controls are built into the system
1.20

Types of Information Systems
and Systems Development
Transaction Processing Systems (TPS)
 Automate handling of data about business
activities (transactions)
Management Information Systems (MIS)
 Converts raw data from transaction processing
system into meaningful form
Decision Support Systems (DSS)
 Designed to help decision makers
 Provides interactive environment for decision
making
1.21

Types of Information Systems
and Systems Development
Expert Systems (ES)
 Replicates decision making process
 Knowledge representation describes the
way an expert would approach the problem
1.22

Systems Development Life
Cycle
System Development Methodology
 Standard process followed in an
organization
 Consists of:
 Analysis
 Design
 Implementation
 Maintenance
1.23

Cycle
Series of steps used to manage the phases
of development for an information system
Consists of six phases:
 Project Identification and Selection
 Project Initiation and Planning
 Analysis
 Design
 Implementation
 Maintenance
1.24

Cycle
 Phases are not necessarily sequential
 Each phase has a specific outcome and
deliverable
 Individual companies use customized life
cycles
1.25

Phases of the Systems
Development Life Cycle
Project Identification and Selection
 Two Main Activities
 Identification of need
 Prioritization and translation of need into a development
schedule
 Helps organization to determine whether or not
resources should be dedicated to a project.
Project Initiation and Planning
 Two Activities
 Formal preliminary investigation of the problem at hand
 Presentation of reasons why system should or should not
be developed by the organization
1.26

Cycle
Analysis
 Study of current procedures and
information systems
 Determine requirements
 Study current system
 Structure requirements and eliminate redundancies
 Generate alternative designs
 Compare alternatives
 Recommend best alternative
1.27

Cycle
Design
 Logical Design
 Concentrates on business aspects of the system
 Physical Design
 Technical specifications
Implementation
 Implementation
 Hardware and software installation
 Programming
 User Training
 Documentation
1.28

Cycle
Maintenance
 System changed to reflect changing conditions
 System obsolescence
1.29

Approaches to Development
Prototyping
 Building a scaled-down working version of the
system
 Advantages:
 Users are involved in design
 Captures requirements in concrete form
Rapid Application Development (RAD)
 Utilizes prototyping to delay producing system
design until after user requirements are clear
1.30

Approaches to Development
Joint Application Design (JAD)
 Users, Managers and Analysts work
together for several days
 System requirements are reviewed
 Structured meetings
1.31

Improving IS Development
Productivity
Computer-aided software engineering
(CASE) tools
 Facilitate creation of a central repository for
system descriptions and specifications
1.32

Summary
Information systems analysis and
design
 Process of developing and maintaining an
information system
Modern approach to systems analysis
 Process-Oriented
 Data-Oriented
1.33

Summary
Four types of information systems
 Transaction Processing (TPS)
 Management Information Systems (MIS)
 Decision Support (DSS)
 Expert Systems (ES)
1.34

Summary
Systems Development Life Cycle
(SDLC)
 Project Identification and Selection
 Project Initiation and Planning
 Analysis
 Design
 Implementation
 Maintenance
1.35

Summary
Alternatives to Systems Development
Life Cycle
 Prototyping
 Rapid Application Development (RAD)
 Joint Application Design (JAD)
Computer-aided software engineering
(CASE) tools
1.36

Chapter01 the systems development environment

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