JSE_V4_N1_RP2 C. Chandra Sekhar Reddy K. Ramakrishna Prasad E. Mamatha B. Sidda Reddy Journal on Software Engineering 2230 – 7168 4 1 18 26 Heterogeneous System, Markov Processes, Queue, Multi Server System, QBD, Time Dependent Failures There are many computer, communication and manufacturing systems which give rise to models where a system bounded or unbounded queue evolves in an environment that changes state from time to time. Multi server system models are important because of their extensive applications in modeling multiprocessors, transaction processing systems, nodes in communication networks. In this paper the performance measures of heterogeneous multiprocessors system with various repair strategies, serving a stream of arriving jobs is considered. The queuing capacity can be bounded or unbounded. Particular attention is paid on development of such systems and solved for exact performability measures. July - September 2009 Copyright © 2009 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=475