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For example , an essay rubric will outline a number of relevant criteria such as essay organisation and structure , knowledge of the content area , use of reference material , and the mechanics of spelling , and grammar . Various aspects of living systems of interest to the mechanical engineer , such as the mechanics of hearing and vision , cardiac and central nervous systems , artificial organs , blood flow behavior , and energy-transfer processes . Speech pathologists help with the mechanics of eating and drinking , as well as the loudness and articulation of speech . Students were understandably curious about the mechanics of the process : How long would it take ? Both of them love the mechanics of the swing , but it got to the point where Howell was working on too many things at once .