ch 4 Flashcards
why analysis
Gathering info about the current existing info system:
identify inputs,outputs,processing in the existing system to fulfill them in the new system
identify problem with system to avoid them in new system
agreement with customer about
requirements
budget
timeline
Interview
adv:
-detailed info
-questions are flexible
-can see body lang
disadv:
-time consuming
-Expensive
-both must be available at the same time
-not anonymous
questionnaires
adv:
-wide range of response
-anoymous
-cheaper then intv
-no time consuming
disadv:
-question are fixed
-risk of misunderstanding
-vague answer
observation
adv:
-reliable info
-no wasting time
disadv:
-uncomfortable
-not all problems appears during it
document study
adv:
-details about paperwork
disadv:
-time consuming
DESIGN
D=database structure
I=input methode
P=processing
O=output methode
Testing
normal is between the range
extreme is net accepted
abnormal is rejected
system test
we input an accepted input so we can control if its working or not
of there is problem we can go back to design
PHASED “replacing part by part”
DISADV:
-takes time
ADV:
-data will be lost in one part only
-medium cost
-time to train
PILOT “branch by branch”
DISADV:
-takes time
ADV:
-data will be lost only in one branch
-mediums cost
-time to train
DIRECT CHANGE
DISADV:
-if new system failed data will be lost
-no time to train
ADV:
-low cost
-fast replacement
PARALLEL RUNNING
DISADV:
-high cost
ADV:
-no data will be lost
-time to train
-fully working immediately
documentation
user: interact with system deal with simple problem
technical: to fix system update
user doc
how to print
FA2
ERROR MESSAGES
trouble shooting guide
glossary of terms
