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ending a message to another object. Polymorphism: Polymorphism means that the same operation can be interpreted differently whe

the object and information can only be exchanged between objects through interfaces. Messages: Messages are the means of communication between objects

Inheritance is a central idea that distinguishes object-oriented methods from other methods. Encapsulation: The unit of enc

is a mechanism by which different classes in a hierarchical association of a class share properties and operations. For two classes A and B if class A is a

Classes: A class is a collection of objects with the same properties and the same operations. Each class generally has instances; a class without instances

wrapper for dedicated operations on this set of attributes. An object can typically consist of three parts

Basic concepts Object-oriented approach includes object-oriented analysis object-oriented design and object-oriented programming

Eations namely phased and continuous. 2.9 Object-Oriented Approach mainly examines the basic concepts of object-oriented

but covers software engineering systems engineering integrated product development and systems procu

repeatable level defined level managed level and optimised level.

been adopted by China's national standards GB/T16260 - 2002 Information Technology Software Product Evaluation Quality Characteristics and

Commonly used international software quality models are ISO/IEC9126 and the McCall model.

quality these activities are planned and organised throughout all phases of software production i.e. the entire life cycle. There are two types of software qualit

planned and organised activities carried out to ensure that a software system

certification of software reliability. Its objectives and results have a very low error rate which is difficult or impossible to achieve by using non formal methods.