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==History==
ADLs have been classified into three broad categories: box-and-line informal drawings, formal architecture description language, and UML ([[
Box-and-line have been for a long time the most predominant means for describing SAs. While providing useful documentation, the level of informality limited the usefulness of the architecture description. A more rigorous way for describing SAs was required. Quoting Allen and Garlan (1997),<ref name="Allen1997">{{Cite journal | last1 = Allen | first1 = R. | last2 = Garlan | first2 = D. | doi = 10.1145/258077.258078 | title = A formal basis for architectural connection | journal = ACM Transactions on Software Engineering and Methodology | volume = 6 | issue = 3 | pages = 213 | year = 1997 | citeseerx = 10.1.1.40.66 | s2cid = 326385 }}</ref> "while these [box-and-line] descriptions may provide useful documentation, the current level of informality limits their usefulness. Since it is generally imprecise what is meant by such architectural descriptions, it may be impossible to analyze an architecture for consistency or determine non-trivial properties of it. Moreover, there is no way to check that a system implementation is faithful to its architectural design." A similar conclusion is drawn in Perry and Wolf (1992),<ref name="PERRY1992">{{Cite journal | last1 = Perry | first1 = D. E. | last2 = Wolf | first2 = A. L. | author-link2 = Alexander L. Wolf| doi = 10.1145/141874.141884 | title = Foundations for the study of software architecture | journal = [[ACM SIGSOFT Software Engineering Notes]]| volume = 17 | issue = 4 | pages = 40 | year = 1992 | url = http://users.ece.utexas.edu/~perry/work/papers/swa-sen.pdf| citeseerx = 10.1.1.40.5174 | s2cid = 628695 }}</ref> which reports that: "Aside from providing clear and precise documentation, the primary purpose of specifications is to provide automated analysis of the documents and to expose various kinds of problems that would otherwise go undetected."
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