Revisión del 13:43 12 jun 2016

Challenges

There are still many research challenges to face within the SBSE field. Among others, the consortium counts with great experience on addressing the following problems:

	Requirements Engineering. The Next Release Problem (NRP) is a well-known SBSE problem that aims at selecting the optimal set of requirements to be implemented in the next project iteration, subject to diverse constraints (Pitanguera et al., 2015). One challenge here is to address the multi-objective version of the problem, where the costs associated to the requirements should be minimized while maximizing the expected benefit (Del Sagrado et al., 2015). Other challenges include the application of exact algorithms and the study of influence of estimation errors (Harman et al., 2014). NRP can be also extended to consider incoming releases, to integrate resource allocation, etc., leading to complex scenarios but with great applicability in practice.
	Automatic software design. Tasks belonging to the analysis and design phases are clearly related to human decisions, so their success strongly depends on the engineer’s expertise and abilities. Despite the related difficulties, SBSE has started to face the automatic design of software in an automatic way (Räihä, 2010). Great efforts are made to address tasks like reverse engineering for software product lines (Lopez-Herrejon et al., 2015), web services design (Parejo et al., 2014) or software architecture optimization (Ramírez et al., 2015b). In this scenario, metaheuristic models should be viewed as a support to software engineers, instead of their replacement. Therefore, the objective is to assist them during the conception, modification and enhancement of software since its very early development.
	Interactive algorithms (human-in-the-loop). Software Engineering tasks can be complex to simulate, especially those when the automatic evaluation of the quality of solutions is not possible. The system analysis phase might be an example. In this scenario, the active participation of the expert in the optimization process is a must, implying the consideration of the human-in-the-loop. This kind of approaches allows integrating expert's abilities with the search process in order to obtain more satisfactory results. Although there are some proposals in areas like software design (Simons and Parmee, 2012; Simons et al., 2014) and testing (Marculescu et al., 2015), interactive mechanisms still require an in-depth analysis. Factors usually involved in interactive approaches are the role of the expert in the search process, the specific requirements of the problem under study or the user fatigue (Ramírez et al., 2015a).
	Software testing. Search Based Software Testing (SBST) represents one of the most studied and fruitful areas of SBSE (Domínguez-Jiménez et al., 2011; Lopez-Herrejon et al., 2014; Ferrer et al., 2015). Recently, three promising research lines have been identified (Harman et al., 2015): the automation of non-functional test cases, putting especial attention into energy consumption; the search of testing strategies in constrast to the generation of test cases; or the joint optimization of several objectives (multi-objective optimization), such as test coverage, execution time or required memory. Harman et al. already announced a promising future for those search-based tools capable of finding bugs, solving them and verifying solutions in a fully automatic way (FiFiVerify tools).
	Software cost estimation. Software cost estimation is a key aspect throughout the software life cycle that can be also addressed from a SBSE perspective (Dolado, 2001). Within this field, there are several proposals using metaheuristic models, though their effectiveness has not been demonstrated to be higher than classic methods. Some participants of the SEBASENet consortium have performed evaluations of estimation models using equivalence analysis techniques (Dolado et al., 2014). It would be desirable to count with a greater number of models in order to complete a more comprehensive assessment.

Referencias

1. Del Sagrado, J., del Águila, I.M., Orellana, F.J. (2015). Multi-objective Ant Colony Optimization for Requirements Selection. Empirical Software Engineering 20(3): 577-610.
2. Dolado, J.J. (2001). On the problem of the software cost function. Information and Software Technology 43(1): 61-72.
3. Dolado, J.J., Otero, M.C., Harman, M. (2014) Equivalence hypothesis testing in experimental software engineering. Software Quality Journal 22(2): 215-238.
4. Domínguez-Jiménez, J. J., Estero-Botero, A., García-Domínguez, A., Medina-Bulo, I. (2011). Evolutionary Mutation Testing. Information and Software Technology 53(10): 1108-1123.
5. Ferrer, J., Kruse, P.M., Chicano, F., Alba, E. (2015). Search based algorithms for test sequence generation in functional testing. Information and Software Technology 58: 419-432.
6. Harman, M., Jia, Y., Zhang, Y. (2015). Achievements, open problems and challenges for search based software testing. Proc. of the IEEE International Conference on Software Testing, Verification and Validation (ICST'15), pp. 1-12.
7. Harman, M., Krinke, J., Medina-Bulo, I., Palomo-Lozano, F., Ren, J., Yoo, S. (2014). “Exact scalable sensitivity for the next release problem”. ACM Transactions on Software. Engineering and Methodology 23(2): 19.
8. Lopez-Herrejon, R.E., Ferrer J., Chicano F., Haslinger E.N., Egyed A., Alba E. (2014). A parallel evolutionary algorithm for prioritized pairwise testing of software product lines. Proc. of the Genetic and Evolutionary Computation Conference (GECCO '14), pp. 1255-1262.
9. Lopez-Herrejon, R.E., Linsbauer, L., Galindo, J.A., Parejo J.A., Benavides, D., Segura, S., Egyed, A. (2015). An assessment of search-based techniques for reverse engineering feature models. Journal of Systems and Software 103: 353-369.
10. Marcurlescu, B., Feldt, R., Torkar, R., Poulding, S. (2015). An initial industrial evaluation of interactive search-based testing for embedded software. Applied Soft Computing 29: 26-30.
11. Parejo, J.A., Segura, S., Fernández, P., Ruiz-Cortés, A. (2014). "QoS-aware web services composition using GRASP with Path Relinking". Expert Systems with Applications 41(9): 4211-4233.
12. Pitangueira, A.M., Maciel, R.S.P, de Oliveira Barros, M. (2015). Softrare requirements selection and prioritization using SBSE approaches: A systematic review and mapping of the literature. Journal of Systems and Software 103: 267-280.
13. Räihä, O. (2010). Search-based software design. Computer Science Review 4: 203-249.
14. Ramírez, A., Romero, J.R., Ventura, S. (2015a). Interactividad en el descubrimiento evolutivo de arquitecturas software. Actas de XX Jornadas españolas de Ingeniería del Software y Bases de Datos (JISBD), Santander.
15. Ramírez, A., Romero, J.R., Ventura, S. (2015b). An evolutionary approach for the evolutionary discovery of software architectures. Information Sciences 305: 234-255.
16. Simons, C.L., Parmee, I.C. (2012). Elegant Object-Oriented Software Design via Interactive, Evolutionary Computation. IEEE Transactions on Systems, Man and Cybernetics, part C: Applications and Reviews 42(6): 1797-1805.
17. Simons, C.L., Smith, J., White, P. (2014). Interactive Ant Colony Optimization (iACO) for Early Lifecycle Software Design. Swarm Intelligence 8(2):139-157.