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Software architecture erosion refers to a gradual gap between the intended and implemented architecture of a software system over time.<ref name="Ruiyin2022">{{Cite journal | last1 = Li | first1 = Ruiyin | last2 = Liang | first2 = Peng | last3 = Soliman | first3 = Mohamed | last4 = Avgeriou | first4 = Paris | doi = 10.1002/smr.2423 | title = Understanding software architecture erosion: A systematic mapping study | journal = [[Journal of Software: Evolution and Process]]| volume = 34 | issue = 3 | pages = e2423 | year = 2022 | url = https://onlinelibrary.wiley.com/doi/abs/10.1002/smr.2423| arxiv = 2112.10934 }}</ref> The phenomenon of software architecture erosion was initially brought to light in 1992 by Perry and Wolf alongside their definition of software architecture.<ref name="PERRY1992"/>
Software architecture erosion may occur in each stage of the software development life cycle and has varying impacts on the development speed and the cost of maintenance. Software architecture erosion occurs due to various reasons, such as ''architectural violations'', ''the accumulation of technical debt'', and ''knowledge vaporization''.<ref name="Ruiyin2021">{{Cite book | last1 = Li | first1 = Ruiyin | last2 = Liang | first2 = Peng | last3 = Soliman | first3 = Mohamed | last4 = Avgeriou | first4 = Paris | doi = 10.1109/icpc52881.2021.00037 | title = The 29th IEEE/ACM International Conference on Program Comprehension (ICPC) | chapter = Understanding architecture erosion: The practitioners' perceptive | pages = 311–322 | year = 2021 | isbn = 978-1-6654-1403-6 | url = https://ieeexplore.ieee.org/document/9463012}}</ref> A famous case of architecture erosion is the failure of Mozilla Web browser.<ref>van Gurp, J. and Bosch, J.: 2002, Design erosion: Problems and causes, Journal of Systems and Software 61(2), 105–119.</ref> Mozilla is an application created by Netscape with a complex codebase that became harder to maintain due to continuous changes. Due to initial poor design and growing architecture erosion, Netscape spent two years redeveloping the Mozilla Web browser, showing how important it is to manage architecture erosion to avoid extensive repair efforts, time and cost losses.
Architecture erosion can decrease software performance, substantially increase evolutionary costs, and degrade software quality. Various approaches and tools have been proposed to detect architecture erosion. These approaches are primarily classified into four categories: consistency-based, evolution-based, and defect-based, and decision-based approach.<ref name=" Ruiyin2022"/> Besides, the measures used to address architecture erosion contains two main types: preventative and remedial measures.<ref name=" Ruiyin2022"/>
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