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{{Short description|Application of metaheuristic search techniques to software engineering}}
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'''Search-based software engineering''' ('''SBSE''') applies [[metaheuristic]] search techniques such as [[genetic algorithms]], [[simulated annealing]] and [[tabu search]] to [[software engineering]] problems. Many activities in [[software engineering]] can be stated as [[Optimization (mathematics)|optimization]] problems. [[Optimization (mathematics)|Optimization]] techniques of [[operations research]] such as [[linear programming]] or [[dynamic programming]] are often impractical for large scale [[software engineering]] problems because of their [[Computational complexity theory|computational complexity]] or their assumptions on the problem structure. Researchers and practitioners use [[metaheuristic]] search techniques, which impose little assumptions on the problem structure, to find near-optimal or "good-enough" solutions.<ref>{{Cite journal |last1=Mohan |first1=M. |last2=Greer |first2=D. |date=2019-08-01 |title=Using a many-objective approach to investigate automated refactoring |url=https://www.sciencedirect.com/science/article/pii/S0950584919300916 |journal=Information and Software Technology |volume=112 |pages=83–101 |doi=10.1016/j.infsof.2019.04.009 |issn=0950-5849}}</ref>
SBSE problems can be divided into two types:
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| first = Mark
| title = Why Source Code Analysis and Manipulation Will Always be Important
|
| year = 2010
}}</ref>
==Definition==
SBSE converts a software engineering problem into a computational search problem that can be tackled with a [[metaheuristic]]. This involves defining a search space, or the set of possible solutions. This space is typically too large to be explored exhaustively, suggesting a [[metaheuristic]] approach. A metric
{{Cite conference
| doi = 10.1109/METRIC.2004.1357891
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|author2=John A. Clark
| title = Metrics are fitness functions too
|
| year = 2004
}}</ref> (also called a fitness function, cost function, objective function or quality measure) is then used to measure the quality of potential solutions. Many software engineering problems can be reformulated as a computational search problem.<ref>{{Cite journal
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| journal = [[IEE Proceedings - Software]]
| year = 2003
| doi-broken-date = 12 July 2025
| citeseerx = 10.1.1.144.3059
}}</ref>
The term "[[search-based application]]", in contrast, refers to using [[search
==Brief history==
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| year = 2004
| citeseerx = 10.1.1.122.33
| s2cid = 17408871
}}</ref> Search techniques have been applied to other [[software engineering]] activities, for instance, [[requirements analysis]],<ref>
{{Cite journal
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| date = 2004-03-15
| citeseerx = 10.1.1.195.321
| s2cid = 710923
}}</ref><ref>{{Cite conference
| doi = 10.1109/SBES.2009.23
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| first5 = Geraldo R.
| title = A New Approach to the Software Release Planning
|
| year = 2009
}}</ref> [[software design|design]],<ref>
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| date = 2001-12-15
| citeseerx = 10.1.1.102.6016
}}</ref><ref>{{Cite journal|last=Räihä|first=Outi|date=2010-11-01|title=A survey on search-based software design|journal=Computer Science Review|volume=4|issue=4|pages=203–249|doi=10.1016/j.cosrev.2010.06.001|issn=1574-0137|url=https://trepo.tuni.fi/bitstream/10024/65330/1/D-2009-1.pdf|citeseerx=10.1.1.188.9036}}</ref> [[Code refactoring|refactoring]],<ref>{{Cite journal|last1=Mariani|first1=Thainá|last2=Vergilio|first2=Silvia Regina|date=2017-03-01|title=A systematic review on search-based refactoring|journal=Information and Software Technology|volume=83|pages=14–34|doi=10.1016/j.infsof.2016.11.009|issn=0950-5849}}</ref> [[software development|development]],<ref>
{{Cite journal
| doi = 10.1016/j.ins.2006.12.020
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| first3 = Mark
| title = Search-based techniques applied to optimization of project planning for a massive maintenance project
|
| year = 2005
| citeseerx = 10.1.1.63.8069
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[[Requirements engineering]] is the process by which the needs of a software's users and environment are determined and managed. Search-based methods have been used for requirements selection and optimisation with the goal of finding the best possible subset of requirements that matches user requests amid constraints such as limited resources and interdependencies between requirements. This problem is often tackled as a [[MCDM|multiple-criteria decision-making]] problem and, generally involves presenting the decision maker with a set of good compromises between cost and user satisfaction as well as the requirements risk.<ref>
{{Cite thesis
| type =
| publisher = University of London
| last = Zhang
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Y. Zhang and M. Harman and S. L. Lim, "[http://www.cs.ucl.ac.uk/fileadmin/UCL-CS/images/Research_Student_Information/RN_11_12.pdf Search Based Optimization of Requirements Interaction Management]," Department of Computer Science, University College London, Research Note RN/11/12, 2011.
</ref>
<ref>{{cite book|last1=Li|first1=Lingbo|last2=Harman|first2=Mark|last3=Letier|first3=Emmanuel|last4=Zhang|first4=Yuanyuan|title
===Debugging and maintenance===
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| pages = 3–13
| last1 = Le Goues
| first1 = Claire | author1-link = Claire Le Goues
| last2 = Dewey-Vogt
| first2 = Michael
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| first4 = Westley
| title = A systematic study of automated program repair: Fixing 55 out of 105 bugs for $8 each
|
| year = 2012
}}</ref>
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| first2 = Xin
| title = A novel co-evolutionary approach to automatic software bug fixing
|
| year = 2008
| citeseerx = 10.1.1.159.7991
}}</ref>
===Testing===
Search-based software engineering has been applied to software testing, including the automatic generation of test cases (test data), test case minimization and test case prioritization.<ref>{{Cite
===Optimizing software===
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| url = http://www0.cs.ucl.ac.uk/staff/w.langdon/ftp/papers/Langdon_2013_ieeeTEC.pdf
}}</ref>
A recent work by Basios et al. shows that by optimising the data structure, Google Guava found a 9% improvement
===Project management===
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| first3 = Xin
| title = Evolutionary algorithms for the project scheduling problem: runtime analysis and improved design
|
| ___location = New York, NY, USA
| series = GECCO '12
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==Tools==
Tools available for SBSE include OpenPAT
{{cite
|last1 = Mayo
|first1 = M.
|last2 = Spacey
|first2 = S.
|title = Search Based Software Engineering
|
|series = Lecture Notes in Computer Science
|volume = 8084
|pages = 158–171
|year = 2013
|doi = 10.1007/978-3-642-39742-4_13
|chapter-url= https://researchcommons.waikato.ac.nz/bitstream/10289/7763/1/SBSE13.pdf
|hdl= 10289/7763
}}</ref> and [[EvoSuite]] <ref>(http://www.evosuite.org/)</ref> and [https://coverage.readthedocs.io/ Coverage], a code coverage measurement tool for Python<ref>{{Citation|last=others|first=Ned Batchelder and 100|title=coverage: Code coverage measurement for Python|url=https://bitbucket.org/ned/coveragepy|accessdate=2018-03-14}}▼
|isbn = 978-3-642-39741-7
|hdl-access= free
▲}}</ref>
</ref>
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Successful applications of SBSE in the industry can mostly be found within software testing, where the capability to automatically generate random test inputs for uncovering bugs at a big scale is attractive to companies. In 2017, [[Facebook]] acquired the software startup Majicke Limited that developed Sapienz, a search-based bug finding app.<ref>{{cite web
|url = https://venturebeat.com/2018/12/30/sapienz-facebooks-push-to-automate-software-testing/
|title = Sapienz:
|date = 30 December 2018
|website = VentureBeat
|
}}</ref>
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|date = 18 October 2013
|website = The Shape of Code
|
}}
</ref> In the context of SBSE use in fixing or improving programs, developers need to be confident that any automatically produced modification does not generate unexpected behavior outside the scope of a system's requirements and testing environment. Considering that fully automated programming has yet to be achieved, a desirable property of such modifications would be that they need to be easily understood by humans to support maintenance activities.<ref>
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| pages = 421–443
| last1 = Le Goues
| first1 = Claire | author1-link = Claire Le Goues
| last2 = Forrest
| first2 = Stephanie
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{{Cite conference
| publisher = IEEE Press
| conference = First International Workshop on Combining Modelling with Search-Based Software Engineering, First International Workshop on Combining Modelling with Search-Based Software Engineering
| pages = 49–50
| last = Simons
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| title = Whither (away) software engineers in SBSE?
| ___location = San Francisco, USA
|
| date = May 2013
| url = http://eprints.uwe.ac.uk/19938/
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*[https://scholar.google.co.uk/citations?view_op=search_authors&hl=en&mauthors=label:sbse Google Scholar page on Search-based software engineering]
[[Category:Computer-related introductions in 2001]]
▲[[Category:Software engineering]]
[[Category:Software testing]]
[[Category:Search algorithms]]
[[Category:Optimization algorithms and methods]]
[[Category:
[[Category:Software quality]]
[[Category:Program analysis]]
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