An Approach for Software Reliability Model Selection. - Ch. Ali Asad; Muhammad Irfan Ullah; Muhammad Jaffar-Ur Rehman (COMPSAC, 2004)

Towards Comprehensive Release Planning for Software Product Lines. - Muhammad Irfan Ullah; Günther Ruhe (IWSPM, 2006)

One Product Versus Product Line: Decision Support Based on Customer Needs Analysis. - Muhammad Irfan Ullah; Günther Ruhe (SPLC (2), 2007)

Towards Design and Architectural Evaluation of Product Variants: A Case Study on an Open Source Software System. - Muhammad Irfan Ullah; Günther Ruhe; Vahid Garousi (SEKE, 2009)

Decision support for moving from a single product to a product portfolio in evolving software systems. - Muhammad Irfan Ullah; Günther Ruhe; Vahid Garousi (J. Syst. Softw., 2010)

Decision support for evolving a single software product to a software product line. - Muhammad Irfan Ullah (2011)