§ystem Analysis and

Design
SN A

Prepared By:
Syed Aamir Abbas
Muhammad Safdar
MPhil Student
(Semester-I) 2012-14
Minhaj University Lahore.
~ Objectives
|

Define the terms system, system analysis, and system design.

J\L o

Types of systems.

Describe the principal functions of the systems analyst.

List and describe the phases of the systems development life cycle.

Describe the various data gathering and analysis tools.

Describe a selection of systems design tools.

Alternative approaches to Structured analysis & Design to the SLDC

Explain the role of the maintenance task in the systems development

life cycle.
 Contents
~_* What is System Analysis and Design?

System Analyst.

» System Development Life Cycle.

Feasibility Analysis.

Design.

» Development

Implementation.
LYSIEms Analysis ana
Design

System Analysis and

Design: what is it?

Firstly we will define the system, than system analysis and system design as
well.

* System
A set of detailed methods, procedures and routines
established or formulation to carry out specify activity,
perform a duty or solve a problem.
LYSIEms Analysis ana
Design

¢ System Analysis

¢ The dissection of a system into its component pieces to study how

~ those component pieces interact and work.

(1) The survey and planning

(2) The study and analysis

(3) The definition

¢ System Design

The process of defining the architecture, components, modules,

interfaces and data for a system to satisfy specified requirements.
LYSIEMs Analysis and
Design

' Need for System Analysis and Design

e Installing a system without proper planning leads to great user

dissatisfaction and frequently causes the system to fall into
disuse

o Lends structure to the analysis and design of information

systems

o A series of processes systematically undertaken to improve a

business through the use of computerized information systems
LYSIEMs Analysis and
Design

Roles of the System Analyst

B | The analyst plays a key role in information systems development

projects.

0 Must understand how to apply technology to solve business

problems.

o Analyst may serve as change agents who identify the

organizational improvement.
 ANnalysis ana

Qualities of the System Analyst

o Problem solver

o Communicator

o Strong personal and professional ethics

o Self-disciplined and self-motivated

IS Analysis anad

System Analyst Recommend, Design, and

Maintain Many Types of Systems for Users

N\
Strategic
Level

Higher
Level
A system analyst
may be involved
Knowledge with any or all of
Level these systems at
each organization
level
oYSIems Analysis ana
Design

OPERATIONAL LEVEL
Transaction Processing System (TPS)
~ Ttisaprocess of large amounts of data for routine business transactions.
¢ Boundary-Spanning
Its concerned with the detection of information. It has two primary sources and two
main sources.

Primary sources of Information

(1) Detect information
(2) Send information into the environment presenting the company in a favorable light.

Main sources of Information

(1) Business intelligence.
(2) Competitive information

e Support the day-to-day operations of the company

Example: Payroll Processing, Inventory Management.
LYSIEMsS Analysis and
Design

KNOWLEDGE LEVEL

o Office Automation System (OAS)

» Supports data workers who share information, but do not usually create new
knowledge
Examples: Word processing, Spreadsheets etc.

o Knowledge Work System (KWS)

= Supports professional workers such as scientists, engineers, and doctors
Examples: computer-aided design systems, virtual reality systems, investment
workstations
LYSIEMs Analysis ana
Design

Higher Level
- d Management Information System (MIS)
To supports data worker who share information but do not usually create new knowledge.

Example: Word processing, Spreadsheets, Desktop publishing, Email Electronic

scheduling, Communication through voice mail, Email, Video

o Decision Support System (DSS)

Aids decision makers in the making of decisions
Examples: financial planning with what-if analysis, budgeting with modeling

o Expert System (ES)

Captures and uses the knowledge of an expert for solving a particular problem which leads
to a conclusion or recommendation.
Examples: MYCIN (an carly xpert system that used artificial intelligence ;
XCON (eXpert CONfigurer)
LYSIems Analysis ana
Design

Strategic Level
- 0 Executive Support System (ESS)
» Helps executives to make unstructured strategic decisions in an informed way
Examples: drill-down analysis, status access

© Group Decision Support System (GDSS)

e Permit group members to interact with electronic support
Examples: email, Lotus Notes

o Computer-Supported Collaborative Work System

(CSCWS)
e CSCWS is a more general term of GDSS. It may include software support called
“groupware” for team collaboration via network computers.
Example: video conferencing, Web survey system
YSIEMS Analysis and
Design

Integrating New Technologies into

Traditional Systems

o 6 Ecommerce and Web Systems.

o Enterprise Resource Planning Systems.

o Wireless Systems.

© Open Source Software.

o Need for Systems Analysis and Design.

ANnalysis ana

Systems analysts need to be aware that integrating

technologies affects all types of system
OYSIEMS Analysis ana
Design

Ecommerce and Web Systems

0 Benefits
Increasing user awareness of the availability of a service,
product, industry, person, or group.

The possibility of 24-hour access for users.

Improving the usefulness and usability of interface design.

Creating a system that can extend globally rather than remain

local, thus reaching people in remote locations without worry
of the time zone in which they are located.
 ANalysis ana

nterprise Resource Planning Systems

(ERPS)

o Performs integration of many information systems existing

on different management levels and within different
functions
Example: SAP, Oracle
OYSIEMS Analysis ana
Design

Wireless Systems
o System analyst may be asked to design standard or wireless
- communication networks that integrate voice, video and email
into organizational intranets or industry extranets

o System analyst may also be asked to develop intelligent agents

o Example: Microsoft's new software based on Bayesian statistics

o Wireless communication is referred as m-commerce (mobile

commerce)
LYSIEMs Analysis ana
Design

~ Open Source Software (OSS)

R o‘; An alternative of traditional software development where
~ proprietary code is hidden from the users

o Open source software is free to distribute, share and modify

o Characterized as a philosophy rather than simply the process of

creating new software

o Example: Linux Operating System, Apache Web Server,

Mozilla Firefox Web browser, Koha, Newgenlib, Evergreen,
OPALS, Greenstone, DSpace, Plone, Drupal, Eprint, and Joomla.
Analysis and

SYSTEMS DEVELOPMENT LIFE

CYCLE (SDLC)
Typically the SDLC has 7 steps in the in the development and
improvement of a computer system
2 Determining human
1 Identifying problems, in]ofma{iong
opportunities, and requirements
objectives

3 Analyzing
system needs
7 Implementing
and evaluating
the system

4 Designing
the
recommended
. system
6 Testing and 5 Developing and
maintaining documenting
the system software
LYSIems Analysis ana
Design

IDENTIFYING PROBLEMS,
OPPORTUNITIES, AND OBJECTIVES

O Activity:
¢ Interviewing user management
e Summarizing the knowledge obtained
o Estimating the scope of the project
¢ Documenting the results
o Output:
» Feasibility report containing problem definition and objective
summaries from which management can make a decision on
whether to proceed with the proposed project
LYSIiems Analysis ana
Design

DETERMINING HUMAN
INFORMATION REQUIREMENTS
O Activity:
¢ Interviewing
¢ Sampling and investing hard data
¢ Questionnaires
» Observe the decision maker’s behavior and environment
e Prototyping
¢ Learn the who, what, where, when, how, and why of the
current system
o Output:
e Analyst understands how users accomplish their work when
interacting with a computer; and begin to know how to make
the new system more useful and usable. The analyst should
also know the business functions and have complete
information on the people, goals, data and procedure involved
LYSIeMms Analysis ana
Design

ANALYZING SYSTEM NEEDS

o Activity:
» Create data flow diagrams.
« Complete the data dictionary.
» Analyze the structured decisions made.
» Prepare and present the system proposal.

o Output:
« Recommendation on what, if anything, should be done.
 Analysis and

DESIGNING THE RECOMMENDED

SYSTEM
o Activity:
» Design procedures for data entry
¢ Design the human-computer interface
¢ Design system controls
Design files and/or database
Design backup procedures

o Output
¢ Model of the actual system
LYSIiems Analysis ana
Design

DEVELOPING AND DOCUMENTING

SOFTWARE

O Activity:
e System analyst works with programmers to develop any original
software
e Works with users to develop effective documentation
e Programmers design, code, and remove syntactical errors from
computer programs
e Document software with help files, procedure manuals, and Web
sites with Frequently Asked Questions

o Output:
e Computer programs
¢ System documentation
 ANnalysis ana

TESTING AND MAINTAINING THE

SYSTEM

O Activity:
e Test the information system
¢ System maintenance
¢ Maintenance documentation

O Output:
¢ Problems, if any
¢ Updated programs
¢ Documentation
 ANnalysis ana

IMPLEMENTING AND EVALUATING

THE SYSTEM

O Activitys
e Train users
e Analyst plans smooth conversion from old system to new
system
¢ Review and evaluate system

O Output:
e Trained personnel
e Installed system
 ANnalysis ana

THE IMPACT OF MAINTENANCE

O Maintenance is performed for two reasons

* Removing software errors.

* Enhancing existing software.

ANnalysis ana

RESOURCE CONSUMPTION OVER

THE SYSTEM LIFE

Major Changes
in Both Business
and Technology

Postinstallation Minor Changes

Bugs Due to Bugs and
l Enhancements

Amount of
Resources
Consumed,
Time and
Systems
Development
|
Money

Installation
Day
 ANnalysis ana

FEASIBILITY ANALYSES

o Technical Feasibility: can we build it?

o Economic Feasibility: should we build it?

o Organizational Feasibility: if we build it, will they come?

LYSIems Analysis ana
Design

TECHNICAL FEASIBILITY: CAN WE

BUILD IT?
o Familiarity with application: less familiarity more risk.

o Familiarity with technology: less familiarity generates more

risk.

o Project size: large projects have more risk.

o Compatibility: the hard it is so integrate the systems with the

company’s existing technology, the higher the risk will be.
 ANalysis ana

ECONOMIC FEASIBILITY: SHOULD WE BUILD IT?

o Development Costs.

o Annual operating costs.

o Annual benefits (cost saving and revenues).

o Intangible costs and benefits.

 ANalysis ana

ORGANIZATIONAL FEASIBILITY: IF WE BUILD IT,

WILL THEY COME?

o Project champion(s).

© Senior management.

o Users.

o Other stakeholders.

o Is the project strategically aligned with the business.

LYSIems Analysis ana
Design

OBJECT-ORIENTED SYSTEMS
ANALYSIS AND DESIGN (OOSAD)

o Analysis is performed on a small part of the system followed by

design and implementation. The development cycle repeats with
analysis, design and implementation of the next part and this
repeats until the project is complete
 ANnalysis ana

ALTERNATE APPROACHES TO STRUCTURED

ANALYSIS AND DESIGN AND TO THE SYSTEMS
DEVELOPMENT LIFE CYCLE

o Agile approach.

o Prototyping

o Ethics

o Project champion Approach

o Soft Systems Methodology (SSM)

o Multiview
 ANnalysis ana

SUMMARY
o Information is a key resource.

o Systems analysts deal with many types of information systems.

o Integration of traditional systems with new technologies.

o Roles, qualities and skills of the systems analyst.

o The systems Development Life Cycle.

o Feasibility Analysis.

o Alternate Approaches to structured analysis and design and to the

SDLC.
 ANnalysis ana

REFERENCES

o Systems Analysis and Design / by Kenneth E. Kendall and Julie E.

Kendall- 8t ed.- New Delhi: PHI Learning, 2011

o Systems Analysis and Design / Alan Dennis, Berbara Haley Wixom and
Roberta M. Roth.-4t th.- New Jersey: John Wiley & Sons, 2010.

o Dictionary of Computer and Information Technology / S. K. Bansal.-

New Delhi: A. P. H. Publishing, 2009.