Acsc 155 system analysis and design 2 systems investigation
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ACSC 155 System Analysis and Design 2. Systems Investigation. Systems Investigation (4 methods). 1. Interview 2. Questionnaire 3. Record Inspection 4. Observation. 1.Interviewing. Always start at the top people of the company asking permission to interview subordinates – ask them as well

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ACSC 155 System Analysis and Design 2. Systems Investigation

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Acsc 155 system analysis and design 2 systems investigation

ACSC 155 System Analysis and Design2. Systems Investigation

Dr. Stephania Loizidou Himona


Systems investigation 4 methods

Systems Investigation (4 methods)

  • 1. Interview

  • 2. Questionnaire

  • 3. Record Inspection

  • 4. Observation

Dr. Stephania Loizidou Himona


1 interviewing

1.Interviewing

  • Always start at the top people of the company asking permission to interview subordinates – ask them as well

  • You will need a check list before you conduct the interview

    Advantage: Straight from the ‘horse’s mouth’

    Disadvantage: Without initial model or existing system, very difficult to where to start (time)

Dr. Stephania Loizidou Himona


2 questionnaire

2. Questionnaire

  • Suitable for large number of ‘users’

  • Distributed over large geographical area

  • General public users

    Advantage: Time saving when a lot of far flung interview would otherwise be required

    Disadvantage: Unrepresentative sample due to low response

Dr. Stephania Loizidou Himona


3 record inspection

3. Record Inspection

  • Necessary for data analysis and definition

    Advantage: Impossible to investigate current system without seeing documentation (imagine describing in detail an order form in an interview)

    Disadvantage: You could be viewing out-of-date, used differently now documents

Dr. Stephania Loizidou Himona


4 observation

4. Observation

  • Watch ‘users’ work

  • Work with ‘users’

  • Partial observation, user ‘talks through’ process

    Advantage: See informal system. See exactly which documents used and how

    Disadvantage: Observes may feel under pressure to go by the book. Time

Dr. Stephania Loizidou Himona


Problems in investigation

Problems in Investigation

  • Commitment to old system

  • Resistance to change

  • Embarrassment

  • Fear of Job Loss

  • Lack of interest

  • Analyst's lack of skill. Conflicting interests

  • Territorial Instincts

  • Expressing position too early

Dr. Stephania Loizidou Himona


Project initiation

Project Initiation

  • A problem with the existing system

  • New technology - greater benefits or lower costs

  • Formalise manual or informal system

  • New information required

  • Resources become available for ‘frozen’ investigation

Dr. Stephania Loizidou Himona


Past history

Past History

1. Little Analysis

2. Poorly Defined Tasks

3. Well defined User Role

End Products

Lengthy Narrative Specifications

1. Difficult to: Read, Understand, Change

2. Confused: Requirements, Design, Implementation

Dr. Stephania Loizidou Himona


Resulting systems

Resulting Systems

1. Took too long to build

2. Cost too much

3. Failed to meet requirements

4. Failed to meet constraints

5. Were inflexible

6. Were poorly documented

Dr. Stephania Loizidou Himona


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