By promoting the use of software components that commercial vendors or in-house developers build, the component-based software development approach promises large-scale software reuse. • It emerged from the failure of object-oriented development to support effective reuse. A component-based process model: The creation of software is characterized by change and instability and therefore any diagrammatic representation of the component-based process model should consider overlapping and iteration between its phases. 1. formal Incremental model. 6. Spiral model. Software development costs, time-to-market and quality product are the three most important factors affecting the software industry. Rapid application development model (RAD). v It leads to software re-used and re-usability provides a number of tangible benefits. Component-based software engineering (CBSE) can be defined as an approach to software development that relies on software reuse. (Section 4.2.1) Component-based process models promote software reuse and reusability and can result in a reduction in development cycle times, a reduction in project costs, and an increase in productivity. One such practice is development of software using Component Based Software Development … COMPONENT BASED SOFTWARE ENGINEERING 2. • Component Based Software Engineering(CBSE) is a process that emphasis the design and construction of computer based system using reusable software “components”. Component-based software engineering (CBSE), also called components-based development (CBD), is a branch of software engineering that emphasizes the separation of concerns with respect to the wide-ranging functionality available throughout a given software system.It is a reuse-based approach to defining, implementing and composing loosely coupled independent components into systems. 1 & 2, 2008. Component-based development is oriented on creating reusable software components thus it can be used in the context of different software development lifecycles and architectural styles. By applying component-based development in the context of 4+1 architectural style as suggested by Stevens and Pooley [120], the following UML diagrams are developed for each of the architecture view: v It leads to significant reduction in project cost. 3. There are many variants of these models e.g. A consensus may be drawn on the phases pertinent to a software life cycle. Gill N. S., Tomar P, “X Model: A New Component-Based Model”, MR International Journal of Engineering and Technology, Vol. 4. Component-based software engineering : The system is assembled from existing components. Evolutionary development: Specification, development and validation are interleaved. Research and development (R&D) activity or the introduction of a new service or a product. The model divides the software development process into 4 phases – inception, elaboration, construction, and transition. 5. The Rational Unified Process (RUP) The Rational Unified Process (RUP) is also a combination of linear and iterative frameworks. v It leads to reduction in development cycle time. Contemporary software development practices require a new approach to software cost estimation. Various tools and techniques are invented by researchers and practitioners to improve in delivering quality software systems with lower cost and shorter time to market. A component-based process model fosters the development of a project by identifying and reusing components that already exist. 7. It aims at reducing costs of building software through developing different components and integrating them to a well-defined software architecture. Traditional software estimation models are directed towards large monolithic software development projects. 8. 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