Dar, H. S. ., and A. . Abbasi. “Requirement Modeling &Amp; Simulation: A Case of UOGIS”. University of Sindh Journal of Information and Communication Technology, vol. 2, no. 2, Apr. 2018, pp. 115-24, https://sujo.usindh.edu.pk/index.php/USJICT/article/view/519.