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Bachelor of Information TechnologyExternal Degree Programme

Systems Analysis and Design

University of Colombo School of Computing

Ref_1 : System Analysis and Design Methods By Whitten, Bentley, Dittman ISBN 0-07-044539-7 (5 th Edition)Ref_2 : System Analysis and Design By Igor Hawryszkiewycz (4 th Edition) ISBN 81-203-1670-3

Ref_3 : Practical SSADM Version 4 A Complete Tutorial Guide By Philip L Weaver ISBN 0-273-60095-8

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Introduction toProblem Definition

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Introduction

There are 3 important factors to be considered when defining a problem.

1. Project goal : What the users expect the system to do?

2. Project bounds :Set the project boundaries

3. Resource limits:Specify the resources to be available to the project

Problem Definition- It is the activity of identifying the problem, understanding the problem(including causes and effects), and

- Understanding any constraints that may limit the solution

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Introduction.

We must then justify that solvingthe problem using computers isuseful to the business and not justinteresting.

Most important and first questions to ask in systems work are

This justification is made toOurselves and More importantlyto users

What systemshould weanalyze?

Whatproblems arewe going totackle?

How mightwe improveit?

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Solutions in this stage are broad in concept and are sometimes known as theconceptual solution

Agreeing on a conceptual solution is often seen on the first phase of anydevelopment.

ConceptualSolution

Earlier in theDevelopment phase

Define User Requirements

Create precisesystem

specificationLater in theDevelopment phase

For more details refer - Ref_2: page 64

Introduction.

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Identifysystem

dependencies

Developprojectgoals

Generate

broadalternativesolutions

Evaluate

feasibility

Problem boundaries

PROBLEMDEFINITION

FEASIBILITYSTUDY

Problems andideas Mission

User needs

System

dependencies

Systemdeficiencies

Goal

Constraints

Alternatives

Selected

Alternatives

Possible revision

Feasibility StudyIntroduction

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Feasibility Checkpoints in the Life Cycle

Systems Analysis

Systems Analysis

Systems Design

Feasibility Study.Introduction.

The first feasibility analysis is conducted during thepreliminary investigation phase. Find the first-cut estimate of development costs.

The next checkpoint occurs after a more detailed study andproblem analysis of the current system

Problems and requirements should be known by now. Alternative solutions are defined in terms of Input/outputmethods, data storage methods, etc. Range of options likeleave the current system alone, reengineer the manual system,

etc. are evaluated by the analyst. Each option is analyzed for feasibility.

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Economic feasibility

Economic feasibility concerns returns from investments in a projectWill it be recovered?

Is it worth while to invest?

Necessary to place actual money values againstany:

Purchases needed to implement the system

Activities created by the project

Benefits that will acquire from a new system

Such calculations are often described as cost benefit analysis

Feasibility Study.

For more details refer - Ref_1: pages 367-370

There are popular techniques to Access Economic Feasibility

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Cost Benefit Analysis

Costs associated withdeveloping the system

Rs .

Determining whether a project is worthwhileEconomic feasibility has been defined as a cost-

benefit analysis. Costs and benefits are used todetermine whether the project is economicallyfeasible

Costs

Costs associated withOperating the system

Equipment cost for the new system Personnel costs Computer usage Training costs etc.

Onetime costs that will not recur after project

Has been completed

Recur throughout the lifetime of

The systemEg: Fixed costs

variable costsEg: Software License payments

Eg: Supplies

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Feasibility Analysis of Candidate Systems

Analyzing candidate solutions

NoTechnologically able?

Yes

Organization

Can I accommodate?

Can

Can we have enough background?

You can

System Proposals.

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System Proposals.

Feasibility Analysis Matrix Template

Ranking

EconomicFeasibility

Schedule

Feasibility

TechnicalFeasibility

Operational

Feasibility

DescriptionCandidate 3 NameCandidate 2 NameCandidate 1 Name

Cells contain the feasibility assessment notes for each candidate

Feasibility Analysis of Candidate Systems.

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