科学以及社會學、語言學等領域中，形成一種稱為分層法（英语：method of levels）的心理治療方式。 Forssell, Dag (Editor). Perceptual Control Theory, An Overview of the Third Grand Theory in Psychology:

匈牙利地域統計單位命名法

3[永久失效連結] Correspondence between the NUTS levels and the national administrative units （页面存档备份，存于互联网档案馆） List of current NUTS codes （页面存档备份，存于互联网档案馆） Download

整合层次

(link) Bunge, Mario. The metaphysics, epistemology and methodology of levels. Method, model, and matter. Synthese library. Dordrecht; Boston: D. Reidel

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doi:10.1055/s-1984-30785. J. H. Ruth, Odor Thresholds and Irritation Levels of Several Chemical Substances: A Review, Am. Ind. Hyg. Assoc. J. 47, A-142

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Environmental Studies and Toxicology, (BEST). Acute Exposure Guideline Levels for Selected Airborne Chemicals: Volume 5. Washington D.C.: National Academies

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