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Determining%20System%20Requirements

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Must be careful who you sample and if there is a bias in the answers ... It is harder to judge the accuracy or truthfulness of a questionnaire. ... – PowerPoint PPT presentation

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Title: Determining%20System%20Requirements


1
Determining System Requirements
  • CIS 255

2
Useful Qualities
  • Impertinencequestion everything
  • Impartiality
  • Relaxing of ConstraintsAssume everything is
    possible.
  • Attention to DetailEvery fact must fit every
    other fact
  • Reframinglook at the problem in new ways

3
Traditional Methods
  • Interviews
  • Questionnaires
  • Observations of Workers
  • Business Documents

4
Interviews
  • Plan interviewprepare a checklist, agenda,
    questions
  • Be neutral
  • Listen and take notes
  • Review notestranscribe them within 48 hours
  • Seek diverse points of view

5
Types of Questions
  • Open ended questions what is the worst thing
    about your current system?
  • Close ended questionsmultiple choice,
    true/false, ranking

6
Questionnaires
  • Must be careful who you sample and if there is a
    bias in the answers
  • Questions must be unambigous
  • Better for gathering specific information, than
    for determining general requirments

7
Questionnaires vs Interviews
  • Interviews are more open ended and allow
    immediate follow up on answers
  • Questionnaires allow access to larger groups and
    have a quicker response time.
  • It is harder to judge the accuracy or
    truthfulness of a questionnaire.
  • Questionnaires tend to be less expensive than
    interviews

8
Observation of Workers
  • Observation is essential
  • Workers often do not have a full, accurate
    appreciation for what they do
  • They may take parts of it for granted as being
    too trivial to mention
  • They may not mention the interruptions and other
    events that contribute to what they do

9
Business Documents
  • Documents can tell you
  • Problems with current system
  • Opportunities to meet new needs if only
    information were available
  • Organizational directions
  • Titles and names of key individuals
  • Values of the organization
  • Special information processing circumstances
  • Reasons why the current system has its present
    design
  • Data, rules for processing data

10
Other (Modern Methods)
  • Joint Application Design
  • Business Process Reengineering

11
JAD
  • Joint Application Design brings all the
    stakeholders together in the design
    processliterally bringing them all to one room

12
JAD Participants
  • Session Leader
  • Users
  • Managers
  • Sponsor (Vice President, President of company)
  • Systems analysts
  • Scribe
  • IS staff

13
Business Process Reengineering
  • This is basically to ask the question, if we
    could start over from scratch, how would we
    redesign the system differently.
  • It advocated radical redesign of individual
    business systems
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