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This paper presents a development of transient stability analysis (TSA) software by applying component-based software engineering (CBSE). The TSA application needs software components to be integrated such as linear solver components, load flow analysis (LFA) components, and TSA components. The TSA components are built independently from the LFA and other components. Therefore, the TSA components can be integrated with any load flow package. The power system devices are represented as entity objects and then encapsulated in an independent class hierarchy. In this development, the same object-oriented power system model (OO-PSM) that has been used in the LFA components is reused for developing the TSA components, but it needs to be extended to model new devices such as synchronous machines, exciters, speed-governors, turbines, PSS, and SVC system. The performance of the proposed TSA software was tested with large systems and compared with structural programming. The results exhibit that there is no much difference in the execution time regarding to the quality of the component-based TSA application such as saving in the development resources.