System Design
SYSTEM DESIGN
Description also available in video format (attached
below), for better experience use your desktop.
Introduction
·
It is the evaluation of alternative solutions
to a business design
·
It helps to select the specifications of
hardware, software & communication technology for the selected solution
·
The purpose is to meet the all business requirements
mentioned in the requirement report
System
Design Phases
·
Logical Design
o
Translate the requirement of the users into
detailed functions
o
Conducted via modelling, which involves the
representation of an actual system in a simplistic way
o
Gives abstract representation of the data flows,
inputs & outputs of the system
o
The components of this system are
§ Inputs files
§ Algorithms procedures
§ Output files
§ User dialogue
§ Interface
·
Physical Design
o
System graphical representation showing the
internal & external entities & the flow of data into & out of these
o
Once the blueprint for the new system is
ready, it begins
o
It also includes the process of specifying
hardware & software needed to support it
o
Physical design includes 3 sub-tasks
§ User interface design
§ Data design
§ Process design
·
Construction
o
It begins when the software developmental
tools are chosen
o
The professional programmers translate the
input, output & processes
o
When program module is completed it is tested
o
When all the modules are completed &
tested, the modules are integrated into one coherent program
·
System Testing
o
In system testing the entire integrated
system is tested
o
System is checked against the system requirements
originally defined in the analysis phase by running typical data through the
system
o
Finally the quality of output is examined
& measurement of processing time takes place to ensure that the original
requirements are met
o
The testing must have to include attempts to
get the system to fail
o
It is done so that many unforeseen snags can
be discovered & fixed before the system is introduced
o
If new system passes the test, it is ready
for the introduction in the business units that will use it.
Video
Description
·
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