Introduction to Systems Analysis
& Design
Chapter #1
Systems analysis and design
Is a step-by-step process for developing highquality information systems
An information system combines
information technology, people, and
data to support business requirements
Systems Development
Business information systems are developed by people who are
technically qualified, business-oriented, and highly motivated.
Successful developers also must be good communicators with
strong analytical and critical thinking skills.
Traditionally, a company either developed its own information
systems, called in-house
applications, or purchased systems called software packages
from outside vendors
The Benefits of IS
Handle daily business transactions,
Improve company productivity
Help managers make sound decisions.
fig_01_14
CHAPTER1
THE SYSTEMS ANALYST AND INFORMATION SYSTEMS DEVELOPMENT
-------------------------------------------------------------------------------------------------------------INTRODUCTION
The systems development life cycle (SDLC) is the process of understanding how
an information system (IS) can support business needs, designing the system,
building it, and delivering it to users.
Example : In 2005, an estimated $1 trillion was spent by organizations and
governments on IT hardware, software, and services worldwide.
 5%–15% were abandoned as hopelessly inadequate, before or shortly
after delivery.
 Many of the systems that aren’t abandoned are delivered to the users significantly
late.
 cost far more than expected, and have fewer features than
originally planned.
fig_03_01
CHAPTER1
THE SYSTEMS ANALYST AND INFORMATION SYSTEMS DEVELOPMENT
-------------------------------------------------------------------------------------------------------------Systems Analyst:
The key person in the SDLC who analyzes the business situation, identifies
opportunities for improvements, and designs an information system to implement the
improvements.
 The primary objective of the systems analyst is not to create a wonderful system.
The primary goal is to create value for the organization, which for most companies
means increasing profits.
 the goal is to enable the organization to perform work better so that it can
earn greater profits
fig_03_01
Components of IS
Components
Hardware is the physical components within a
computer system
Software is set of instructions ,written in a specialized language, the
execution of which controls the operation of the computer.
Data is the raw facts that may have no meaningful idea and will be
transformed to Information by the IS
People are persons who will be affected by the IS
Processes describe the tasks and business functions that users, managers,
and IT staff members perform to achieve specific results.
Recently
New companies have appeared that are
specialized in IT development and IS consultancy
E Commerce:
B2C: Business to Consumer ( Ebay & Amazon)
B2B : Business to Business
Users and People
Business Functions
SDLC Phases
Planning Phase: The planning phase is the fundamental process of understanding why
an information system should be built and determining how the project team will go
about building it.
Analysis PhaseThe purpose of the systems analysis phase is to build a logical model of
the new system
Design Phase : The design phase decides how the system will operate in terms of the
hardware, software, and network infrastructure that will be in place.
• the user interface,
• forms,
• reports that will be used;
• the specific programs, databases, and files that will be needed
Implementation Phase:During the systems implementation phase, the new system is
constructed
Systems Development Methods
System Development Methods