System Development Life Cycle -2

Analysis : -

when the feasibility study is completed and the control mechanism is in place, the project team concentrates on the analysis part.

" Analysis is a detailed study of the various operations performed by a system and their relationship with in and out side of the system"

1. Define the scope of the new system.

2. Understand the old information system.

3. Analyse the current system to find the deficiencies in it.

4. Develop the structured functional specification for the new system.

5. Review the feasibility and cost benefit analysis.

A key prossblem in this phase is - what must be done to solve the problem?

Design : -

System design  is the determination of the processes and data that are required by a new system. When the system is computer-based, the design can include a specification of the types of equipment to be used. so, it can said that:

The degign describes a final system and the process by which it is developed. If refers to the technical specification that will be applied in implementing the system.

Implementation and testing : -

 After developing the code (or manufacturing) of the system, it enters into the implementation and testing phase. The implementation phase is less creative than the system design. it is primarily concerned with user training, site preparationand file conversion. It is defined as :

 Implementation is theacquisition and integration of the physical and conceptual resources that produce a working system.

Additionally, the final testing of the complete system is performed to user satisfication and supervision of the initial operation of the new system. During the final testing, user acceptance is tested, followed by user training.

Maintenance : -

Once the system has settled down and been running for some time, the system analyst may be involved in amendment of procedures to adapt the system to changing conditions, in auditing the system to check thast the stated objectives of system are still valid in the present enviorment and in evaluating the achivement of those objectives. So, periodic maintenance of hardware and software are required.

Review and Evolution : -

A review is conducted whether the system objectives are being met with the user requirments and what are the problems in the smooth running. Step are taken to resolve them. This is an audit by the designer for improvements through test  data and audit trails.

Each organisation adopts its own apporach to system development and the apporach will be defined in its data processing standards. For example, Some data procssing departments will merge the initial and detailed studies together into an investigation and outline design phase which includes an assessment of feasibility; other will not bother about feasibility in certain circumstances. During investigation, ideas for improvements and redesign will emerge and during detailed design, a return  to the user department will often be necessary.