A sonority hierarchy or sonority scale is a ranking of speech sounds (or phones) by amplitude. For example, if you say the vowel, you will produce a much louder sound than if you say the stop . Sonority hierarchies are especially important when analyzing syllable structure; rules about what segments may appear in onsets or codas together, such as SSP, are formulated in terms of the difference of their sonority values. Some languages also have assimilation rules based on sonority hierarchy, for example, the Finnish potential mood, in which a less sonorous segment changes to copy a more sonorous adjacent segment (e.g. -tne- → -nne-).
Read more about Sonority Hierarchy: Sonority Hierarchy, Sonority Scale
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“In a hierarchy every employee tends to rise to his level of incompetence.”
—Laurence J. Peter (1919–1990)