J. Niu, “A Measurement Method of Software Flexibility Based on BP Network,” in Proc. Int. Workshop on Intelligent Systems and Applications (ISA), 2009, pp. 1-4.
 S. Peng, “User-Oriented Measurement of Software Flexibility,” in Proc. World Congress on Computer Science and Information Engineering, 2009, pp. 629-633.
 R. Martinho, “A Two-Step Approach for Modeling Flexibility in Software Processes,” in Proc. 23rd IEEE/ACM International Conference on Automated Software Engineering, Italy, 2008, pp. 427-430.
 H. Oliver, O. Philipp, and B. Udo. (2010, Jan.). Improving Software Flexibility for Business Process Changes. Business & Information Systems Eng. [Online]. 2(1), pp. 3-13. Available: http://link.springer.com/article/10.1007/s12599-009-0086-8
 A. Rasoolzadegan and A. Abdollahzadeh. (2014, Jul.). Reliable yet Flexible Software through Formal Model Transformation (Rule Definition). Journal of Knowledge and Information Systems (KAIS), [Online]. 40 (1), PP. 79-126. Available: http://link.springer.com/article/10.1007/s10115-013-0621-2
 A. Rasoolzadegan and A. Abdollahzadeh, “Specifying a Parallel, Distributed, Real-Time, and Embedded System: Multi-Lift System Case Study,” Information Technology and Computer Eng. Faculty, Amirkabir Univ. Technology, Tehran, Iran, Tech. Rep., 2011.
 H. B. Christensen, “Flexible, Reliable Software: Using Patterns and Agile Development,” Chapman and Hall/CRC, 1st ed., 2010.
 H. Eden and T. Mens. (2006, Jun.). Measuring Software Flexibility. IEE Software. [Online]. 153(3), pp. 113-126. Available:
 G. H. Z. Li. (2008, Apr.). Research on Flexibility Metrics in Software Architecture Level. ComputerScience. [Online]. 35 (4). pp. 259-264. Available:
 E. Gamma, R. Helm, R. Johnson, and J. Vlissides, “Design Pattern: Elements of Reusable Object-Oriented Software,” Addison-Wesley Publishing Company, Fifth ed., 1995.
 A. M. Ross, D. H. Rhodes, and D. E. Hastings. (2008, Apr.). Defining Changeability: Reconciling Flexibility,Adaptability, Scalability, Modifiability, and Robustnessfor Maintaining System Lifecycle Value. Systems Engineering. [Online]. 11(3), pp. 246–262. Available:
 R. S. A. DeLoach and V. A. Kolesnikov, “Using Design Metrics for Predicting System Flexibility,” in Proc. Fundamental Approaches to Software Engineering, 2006, pp. 184-198.
 T. Sasaki, N. Yoshioka, Y. Tahara, and A. Ohsuga, “Evaluation of Flexibility to Changes Focusing on the Variable Structures in Legacy Software,” in Proc. Knowledge-Based Software Engineering: 11th Joint Conference, 2014, pp. 252–269.
 Y. Gao and Y. Yang, “Flexibility of Software Development Method,” in Proc. Advances in Intelligent and Soft Computing, 2011, pp. 383-387.
 Y. Wang, M. Jia, J. Guo, and B. Zhang, “Evaluating Model of Software Flexibility of Domestic Foundational Software,” in Proc. International Conference on Electrical and Control Engineering, 2011, pp. 5906-5909.
 S. Jarzabek and H. D. Trung, “Flexible generators for software reuse and evolution,” in Proc. 33rd international conference on Software engineering, 2011, pp. 920-923.
 S. Niu, A. Xu, and Z. Song, “A flexible software framework with dynamic expansible signals,” in Proc. 2014 IEEE UTOTESTCON, 2014, pp. 355-359.
 B. Johnson, W. W. Woolfolk, R. Miller, and C. Johnson, “Flexible Software Design: Systems Development for Changing Requirements,” CRC Press, 1th ed., 2005.
 I. Kim, D. Bae, and J. Hong. (2007, Nov.). A component composition model providing dynamic, flexible, and hierarchical composition of components for supporting software evolution. Journal of Systems and Software. [Online]. 80(11), pp. 1797-1816. Available: http://www.sciencedirect.com/science/article/pii/S0164121207000659