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CHAPTER 4: REQUIREMENT MODELLING (fact-finding (interview, Questionaire…
CHAPTER 4: REQUIREMENT MODELLING
System analysis phase overview
system analysis skills
Analytical Skill
Interpersonal Skills
Team-oriented method & technique
JAD
User involvement
Special type of group meeting
reduce time for requirement collection
RAD
team based technique that speed up information system development
relies on prototype & user involvement
agile method
Modelling tools & technique
functional decomposition diagrams
data flow diagrams
unified modelling language
System requirement checklist
output
report form the entire data that had been processed
input
data that been inserted
process
process in calculating or arranging the data
performance
respond time of the system
control
user control of the system
Future, Growth, Cost & Benefits
scalability
ability to adjust system capacity
total cost ownership
financially calculated number that
estimated the total direct and indirect
direct & indirect cost
fact-finding
interview
Questionaire & survey
Observation
Document review
Research
Documentation
CHAPTER 5: DATA & PROCESS MODELLING
DFD
symbols
creating dfd
draw context diagram
use the name of info system as the process name in the context diagram
use unique name within each set of symbols
do not cross line
provide unique name & reference num for each process
obtain as much user input & feedback as possible
Data dictionary
using CASE tools for documentation
documenting the data element
documenting the data flows
documenting the data stores
documenting the data processes
documenting the data entities
documenting the data records
documenting the data reports
Process Description Tools
Modular Design
Structured english
Decision Table
Decision tree
Logical Vs Physical model
sequence of model
Four model approach
a physical model of the current system
logical model of the current system
logical model of new system
physical model of new system
