Design is a creative process of transforming the problem into solution. It is the description of the solution and called design. The basis of designing is the requirement specification. The designer transforms the requirements of a customer into a final product. Thus, designing works as a bridge between requirement specification and the final product. It is the designing of the system, which ultimately decides the quality of a system as well. If designing is good, end product will be a quality product.
System design is defined as those tasks that focus on the specification of a detailed computer based solution. It is also called physical design. System analysis emphasized on business problem where as system design focuses on the technical or implementation concern of the system. The design phase is a transition from a user-oriented document to a document oriented to the programmers or database personnel.
A good design is very dependent on a particular system, and what is a good design for one system may be bad for another. It is not possible to propose a set of standard solutions from which to select a good design for any system. Design requites considerable creativity to propose the necessary system-specific changes and both are acceptable to users and easy to implement. The designer together with users has to search for a solution using any special knowledge about the system until there is agreement that a satisfactory solution has been found.
Design is an ongoing process but its nature changes as the development process proceeds. Thus design is needed to define the concept. Then during specification, the new system and its requirements are designed. In system design , we design the best computer structures, the programs and so on.