{"id":8933,"date":"2021-03-25T10:28:49","date_gmt":"2021-03-25T10:28:49","guid":{"rendered":"https:\/\/expleoacademy.com\/de-de\/glossar\/explanation\/acyclic-dependencies-principle\/"},"modified":"2026-01-07T07:57:44","modified_gmt":"2026-01-07T07:57:44","slug":"acyclic-dependencies-principle","status":"publish","type":"explanation","link":"https:\/\/expleoacademy.com\/de-de\/glossar\/erklaerung\/acyclic-dependencies-principle\/","title":{"rendered":"Acyclic Dependencies Principle"},"content":{"rendered":"<h3>Was bedeutet Acyclic Dependencies Principle?<\/h3>\n<p>Das\u00a0<a href=\"https:\/\/expleoacademy.com\/dach\/ueber-uns\/unsere-partner\/isaqb-das-international-software-architecture-qualification-board\/\">International Software Architecture Qualification Board<\/a>\u00a0 (<a href=\"https:\/\/expleoacademy.com\/dach\/ueber-uns\/unsere-partner\/isaqb-das-international-software-architecture-qualification-board\/\">ISAQB<\/a>) definiert den Begriff <em>&#8220;Acyclic Dependencies Principle&#8221;<\/em> wie folgt:<\/p>\n<blockquote><p>Unter Acyclic Dependencies Principle versteht man <span style=\"font-size: 1rem;\">&#8220;<\/span><\/p>\n<div>\n<p>A fundamental principle for designing the structure of software systems (also see <a href=\"https:\/\/expleoacademy.com\/de-de\/glossar\/erklaerung\/package-principles\/\">Package Principles<\/a>). It demands that there be no cycles in the dependence graph of a system, which is also a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Directed_acyclic_graph\">necessity<\/a> for <a href=\"https:\/\/en.wikipedia.org\/wiki\/Functional_decomposition\"><em>hierarchical<\/em> decomposition<\/a>.<\/p>\n<p>Avoiding dependence cycles is essential for <a href=\"https:\/\/expleoacademy.com\/de-de\/glossar\/erklaerung\/coupling\/\">low coupling<\/a> and <a href=\"https:\/\/expleoacademy.com\/de-de\/glossar\/erklaerung\/maintainability-quality-attribute\/\">maintainability quality attribute<\/a>, as <em>all<\/em> components in a dependence cycle effectively (even if indirectly) depend on each other, which makes it hard to understand, change or replace any part of the cycle in isolation (also see Lilienthal-2019).<\/p>\n<p>Although Robert C. Martin (Martin-2003) expressed it in terms of large components of object-oriented software, the ADP is a <em>universal<\/em> principle. It goes back (at least) to one of the origins of software architecture, the classic 1972 paper \u201cOn the Criteria To Be Used in Decomposing Systems into Modules\u201d (Parnas-1972), which <em>concludes<\/em> that hierarchical structure along with \u201cclean\u201d decomposition are desirable properties of any system.<\/p>\n<p>It can be argued that a dependence cycle, even before considering its various practical problems, is logically already as flawed as a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Circular_reasoning\">circular argument<\/a> or <a href=\"https:\/\/en.wikipedia.org\/wiki\/Fallacies_of_definition#Circularity\">circular definition<\/a>. As a structural contradiction, a cycle can neither be an <em>appropriate<\/em> nor meaningful model of the inherent nature and purpose of a system. And this conceptual divergence alone virtually guarantees for (unpredictable) problems to arise, which is exactly what a <a href=\"https:\/\/expleoacademy.com\/de-de\/glossar\/erklaerung\/design-principle\/\"><em>principled<\/em><\/a> approach guards against.<\/p>\n<p>Category: Design-Principle<\/p>\n<\/div>\n<p>&#8220;<\/p><\/blockquote>\n<p>Wenn Sie \u00e4hnliche Fachbegriffe wie <strong>Acyclic Dependencies Principle<\/strong> nachschlagen m\u00fcssen, schauen Sie doch einfach in unserm umfangreichen <a href=\"https:\/\/expleoacademy.com\/de-de\/glossar\/\">Glossar<\/a> nach. Oder durchsuchen Sie unser W\u00f6rterbuch:<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Acyclic Dependencies Principle &#8211; In unserem Glossar finden Sie eine Erkl\u00e4rung des Fachbegriffs Acyclic Dependencies Principle<\/p>\n","protected":false},"featured_media":0,"menu_order":0,"template":"","format":"standard","meta":{"footnotes":""},"class_list":["post-8933","explanation","type-explanation","status-publish","format-standard","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Acyclic Dependencies Principle - Glossar, Fachbegriff<\/title>\n<meta name=\"description\" content=\"Acyclic Dependencies Principle - In unserem ISAQB Glossar finden Sie eine Erkl\u00e4rung des Fachbegriffs Acyclic Dependencies Principle\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/expleoacademy.com\/de-de\/glossar\/erklaerung\/acyclic-dependencies-principle\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Acyclic Dependencies Principle - 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