SYSTEM ANALYSIS AND DESIGN Flashcards
WHAT IS THE PUPOSE OF SYSTEM ANALYSIS AND DESIGN
IT IS WHEN YOU LOOK AT AN EXISTING SYMESTEM AND THEN DESIGNING A NEW SYSTEM WHICH CARRAY OUT THE SAME TASK BUT BETTER
What is the system analysis part
it is when the system is looked at in detail and improvements are suggested
What is the design part
it is when detailed plans are created for the proposed new system
what are the six stages involved in system analysis and design
analysis design development and testing implementation documentation evaluation
stage1:
analysis
it is when the current system is looked at in detail in order to figure out what changes need to be made in order to make the new system better
what does analysis involve
1 collecting data about the current system
2 find out problems with the current system
3 establish the problem that the customer needs solving
4 identify input processing and output of the current system
5 identify requirement of the new system
6 producing cost benifit analysis
How is data obtained
interviews
questionnaire
observe people using the current system
looking at current system documentation
questionnaires
prepared question are given to users of the system and are left with them to complete
advantages of questionnaire
questions can be answered quickly
answers are more honest since it is answered anonymously
chap method of gathering data
can be analyzed using a computer
disadvantages of questionare
respond rate is low
if question is not understood it cant be explained
since it cant be explained costumer might answer it wrong which affects validity
interviews
it takes place face to face
advantages of interview
questins can be explained if they are ot understood
more complex questions can be asked which can give more details finding
disadvantages
time consuming
expensive to carry out
answer may no be honest as he person being interviewed cannot remain anonymous
observation
this is when the system analyst sites and watch someone using the system
adavantages
not expensive to carry out as people are not taken away from their job
analyst can see clearly system does well and not well
