Introduction to Unified Approach
All the approach describe above were widely use. But the general feeling was that teach approach lacked something and couldn't be used universal approach to all problems of software design. Thus to solve this problem a unified approach evolved from the combined efforts booch, rumbaugh and Jacobson. This unified approach is known as UML.
UML is organized into two major design activities system design and objects design but before describing these approaches the important concepts of UML will be discussed. Let us elucidate unified modelling language UML.
Modelling is simplification of reality, its is a central part of all activities that leads to the deployment of good software. We build models to communicate the desired structure and behaviour of the system. In short building models help in:
So modelling is very important to be done. In the concern of complexity of a program the modelling plays an important and effective role to reduce it. As we know that when the levels of abstraction increases there are more chances of failure and it will be very difficult to solve the problem.
The unified modelling language UML is a standard is a standard language for writing software blueprints. UML may be used to visualize specify construct and document the artefacts of a software intensive system.
Conceptual Model of UML
UML require three major elements to build its conceptual model. It includes:
One more term required to build UML model is view. A view simply a subset of UML modelling construct, that represents one aspect of the system. One or two kinds of diagrams provide a visual notation for the concepts in each view.
UML can be used for domains like:
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