Initiation
This stage is a stage
which reviews the current system in place; they look at the system and find out
how it can be improved and then at the end of this stage there is a feasibility
study report, and if that report is accepted then more advance research is
carried out
Why is it required?
It’s required because if the programmers
make a new system and add something which was in the old one then it’s not
going to improve the current system, but if they looked at the current system
they would know exactly what they have to do to improve the new system.
Investigation
This stage is all about fact finding and
this involves defining the scope of the system; it investigates in detail on
how the current system works.
This includes how the data is put into the
system and how it flows around the system
Why is it required?
Because they need to know how the current
system works if they are to improve the system, they will have to investigate
in detail.
Analysis
When at the analysis
stage it involves using a number of different techniques to model the flow of
information and interrelationships in the system
Why is it required?
you need to know how the information flows
around the system
Design
The design stage uses
the information that was gathered and analysed in the previous two stages and then
produces a detailed design, this will become a guide for the programmers who
are going to be adding the system.
Why is it required?
Programmers need a
design to follow, if there isn’t a design programmer’s will likely make
mistakes while making it
Implementation
Why is it required?
Because if it wasn’t
implemented then there would be no system so it’s important to implement it
Maintenance
Why is it required?
Because without regular maintenance the
system could break down and possibly become unusable regular maintenance is
required to keep the system updated and working correctly
Testing
Why is it required?
Testing the system is required to eliminate
all bugs within the system doing this will make doing maintenance in the long
run easier
The lifecycle model
The lifecycle model has no
clear start or finish, it is useful to think that the start of the cycle as
being the point where there is dissatisfaction with the existing system, it is
a process of creating or altering information systems and the models and methodologies
that people use to develop the systems
Every development process
and the products life has a cycle with 7 stages it is called the lifecycle
model because the cycle is always on going if a company is not making new
products then the company is analysing their current products
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