1. Basili, V., Caldiera, C., Rombach, D.: Goal, question, metric paradigm. Encycl. Softw. Eng. 1, 528–532 (1994)
2. Lecture Notes in Computer Science;K Beckers,2013
3. Bernárdez, B., Durán, A., Genero, M.: Empirical evaluation and review of a metrics based approach for use case verification. J. Res. Pract. Inf. Technol. 36(4), 247–258 (2004)
4. Bresciani, P., Perini, A., Giorgini, P., Giunchiglia, F., Mylopoulos, J.: Tropos: an agent-oriented software development methodology. Auton. Agent. Multi-Agent Syst. 8(3), 203–236 (2004)
5. Cockburn, A.: Structuring use cases with goals. http://alistair.cockburn.us/Structuring+use+cases+with+goals