System Design

 System design is an important phase of system development life cycle,

This step of system design plays an important part in system development life cycle

When we design a system, first and foremost we prepare its outline which can be called the logical design of the system.

Structured design is a data-flow based method. This method starts with system speci fication which identifies the input and output and describes the functional aspects of the system.

Structured design is a process which minimises the complications and divides the problem into small manageable fragments which is called modulization or decompo sition

The documentation tool is hierarchy or structure chart for structured design."

Module coupling stands for the number of connection between the calling and called modules and the complexity of these connections.

Module cohesion means the relation amidst elements inside a module. If one module performs more than one discrete functions then the direction or the elements are not intimately linked with one another.

Prototyping is a technique under which we create the real form of a thing and on the same basis, further, the similar things are produced. For example, Maruti Co. first creates a model of a new car and after it many similar cars are produced and made available in the market.

Information Engineering is a data-centred and process-sensitive technique which is fully implemented, unlike structured analysis, in an organisation.

Another method of system design is Rapid Application Development, the purpose of which is to combine the prototyping technique and joint application development as well as several structured techniques to intensify system development.

Object oriented design is one of the modern techniques. The function of this technique is to refine the requirements of earlier identified object and to define design specific objects.

Database Design is related to the design of the physical database.

A system design presents new controller elements and changes the control procedure.

Many methods have been created to control the act of processing.

An important function of system controllers is to provide an audit trial. An audit trial, is a designed routine which makes the analyst, the user or the auditor check some process or some field of the new system.

An audit trial contains journals, ledgers and other documents which the auditor uses to find out some transaction done through the system.

Documentation is also required for the proper auditing of a system. Documentation is a basis of review of the internal controls by internal or independent auditors.