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Transcript of Slide 1 Requirements Determination Chapter 5. Slide 2 Objectives ■ Understand how to create a...
Slide 1
Requirements Determination
Chapter 5
Slide 2
Objectives■ Understand how to create a requirements
definition.■ Become familiar with requirements analysis
techniques.■ Understand when to use each requirements
analysis technique.■ Understand how to gather requirements using
interviews, JAD sessions, questionnaires, document analysis, and observation.
■ Understand when to use each requirements-gathering technique.
Slide 3
Key Ideas
The goal of the analysis phase is to truly understand the requirements of the new system and develop a system that addresses them.The first challenge is collecting and integrating the information The second challenge is finding the right people to participate.
Slide 4
Analysis PhaseThis phase takes the general ideas in the system request and
refines them into a detailed requirements definition (this chapter), functional models (Chapter 6), structural models (Chapter 7), and behavioral models (Chapter 8)
This becomes the system proposalIncludes revised project management deliverables,
feasibility analysis (Chapter 3) and workplan (Chapter 4).
Slide 5
Requirement Specification
a statement of what the system must do or characteristics it must haveWritten from businessperson perspective – business requirementLater requirements become more technical – system requirement
Slide 6
Functional vs. Nonfunctional
A functional requirement relates directly to a process the system has to perform or information it needs to contain.Nonfunctional requirements refer to behavioral properties that the system must have, such as performance and usability.
Nonfunctional Requirements
Slide 7
Slide 8
Functional Requirements
Slide 9
Nonfunctional Requirements
Steps of analysis
Understand the as-is systemIdentify improvementsDevelop requirements for the to-be system
Slide 10
Slide 11
Requirements Gathering
Interviews
Slide 12
Interviews -- Five Basic Steps
Selecting intervieweesDesigning interview questionsPreparing for the interviewConducting the interviewPost-interview follow-up
Slide 13
Selecting Interviewees
Based on information neededOften good to get different perspectives
ManagersUsersIdeally, all key stakeholders
Slide 14
Types of Questions
Types of Questions Examples
Closed-Ended Questions * How many telephone orders are received per day?
* How do customers place orders?* What additional information would you like the new system to provide?
Open-Ended Questions * What do you think about the current system?* What are some of the problems you face on a daily basis?* How do you decide what types of marketing campaign to run?
Probing Questions * Why?* Can you give me an example?* Can you explain that in a bit more detail?
Slide 15
Designing Interview Questions
Unstructured interviewBroad, roughly defined information
Structured interviewMore specific information
Slide 16
Questioning Strategies
Slide 17
Interview Preparation Steps
Prepare general interview planList of questionAnticipated answers and follow-ups
Confirm areas of knowledgeSet priorities in case of time shortagePrepare the interviewee
ScheduleInform of reason for interviewInform of areas of discussion
Slide 18
Conducting the Interview
Appear professional and unbiasedRecord all informationCheck on organizational policy regarding tape recordingBe sure you understand all issues and termsSeparate facts from opinionsGive interviewee time to ask questionsBe sure to thank the intervieweeEnd on time
Slide 19
Conducting the InterviewPractical Tips
Don’t worry, be happyPay attentionSummarize key pointsBe succinctBe honestWatch body language
Slide 20
Post-Interview Follow-Up
Prepare interview notesPrepare interview reportLook for gaps and new questions
Slide 21
Interview Report
INTERVIEW REPORT
Interview notes approved by: ____________
Person interviewed ______________Interviewer _______________Date _______________Primary Purpose:
Summary of Interview:
Open Items:
Detailed Notes:
Sample Interview Report
Slide 22
Slide 23
JOINT APPLICATION DESIGN (JAD)
Slide 24
JAD Key Ideas
Allows project managers, users, and developers to work togetherMay reduce scope creep by 50%Avoids requirements being too specific or too vague
Slide 25
Joint Application Design (JAD) Important Roles
Facilitatorsets the meeting agenda and guides the discussion
Scribeassist the facilitator by recording notes, making copies, etc.
Project team, users, and management
Slide 26
Joint Application Design (JAD) Setting
U-Shaped seatingAway from distractionsWhiteboard/flip chartPrototyping toolse-JAD
Slide 27
JAD Meeting Room
JPEG Figure 5-5 Goes Here
Slide 28
The JAD Session
Tend to last 5 to 10 days over a three week periodPrepare questions as with interviewsFormal agenda and groundrulesFacilitator activities
Keep session on trackHelp with technical terms and jargonRecord group inputHelp resolve issues
Post-session follow-up
Slide 29
Managing Problems in JAD Sessions
Reducing dominationEncouraging non-contributorsSide discussionsAgenda merry-go-roundViolent agreementUnresolved conflictTrue conflictUse humor
Slide 30
Questionnaires
Slide 31
Questionnaire Steps
Selecting participantsUsing samples of the population
Designing the questionnaireCareful question selection
Administering the questionnaireWorking to get good response rate
Questionnaire follow-upSend results to participants
Slide 32
Good Questionaire Design• Begin with nonthreatening and interesting
questions.• Group items into logically coherent sections.• Do not put important items at the very end of
the questionnaire.• Do not crowd a page with too many items.• Avoid abbreviations.• Avoid biased or suggestive items or terms.• Number questions to avoid confusion.• Pretest the questionnaire to identify confusing
questions.• Provide anonymity to respondents.
Slide 33
Selecting the Appropriate Techniques
Slide 34
Summary
First Step is to determine requirementsSystems analysts use these techniques
InterviewsJADQuestionnaires