System development life cycle
is a very important method to develop an informative system. System development
life cycle consist of six step and involves different persons. A system
development life cycle work as an iterative model. Any change that is required in
the system at any stage, the system development life cycle provide this
facility to move back at any step to meet the requirements of the user’s. In
SDLC model the risk of not meeting user’s requirement is less. The money and
time is saved in system development life cycle (SDLC) model.
The steps of system
development life cycle are as follow:
1.
Preliminary
investigation/ system planning
2.
Requirement analysis
3.
System design
4.
System development
5.
System testing and
integration
6.
System implementation
7.
System maintenance
Figure: step of system development life cycle
1.
Preliminary investigation/system planning:-
Preliminary
investigation is the first step of system development life cycle. In this step
we interview the user. The preliminary investigation step involves to finds a user
requirement and present problem in the current system. In this step we
determine the resources or technologies, the cost of the software. If the
proposed system is accepted by the user then next phase is started otherwise
repeat this step again and again to meet the user requirement.
2.
Requirement analysis:-
In this step, system
analyst study the operation of the system and their relationship within an
outside the system, and study that where improvement are required and how
system work. Requirement specification document is produce in this step.
3.
System design:-
In this step new system is design to meet the requirements of the user.
The design of a new system depends on the requirements indentified in system
analysis phase. System design defines the display of the system, the output of
system.
4.
Software development:-
Actual coding of the
program is done in this step. The program is checked by using a dummy data.
Documentation is prepared to explain certain procedure.
5.
System testing and integration:-
Program
is tested individually to check the develop program work according to the
requirement. After individual testing the program module are integrated and
then integrated module is tested to check whether system is work according to
specification. The system is checked with actual data by real user’s, and the
result of the process is examines to ensure that the result is correct or not.
If result is not correct or not according to requirement then adjustment is made
in the program.
6.
System implementation:-
In this
step, the develop system is install and hand over to the user, and system
user's are trained to operate the system carefully.
7.
System maintenance:-
Maintenance of
the system depends upon on modification and enhancements of the system.
Maintenance of the system means that the current system working is effective
even if system environment such as hardware, software is modified. The current
system must up- to- date regularly.
