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Several researchers have tried to define "readability" as features of a text that enable readers to grasp the message or information quickly. However, the experience a reader has with the subject being discussed and his or her familiarity with the vocabulary and concepts affects how quickly and effectively the reader interprets a text. Indexes developed in the mid-twentieth century (such as the "fog index") focused on the number of words as well as the number of polysyllabic words per sentence. Today experts advise paying attention to the audience's level of expertise in choosing words and controlling sentence length. They also emphasize using sentences that put the agent (human, concrete, or abstract) into the subject and the action into the verb (with the object following) to make sentences easy to comprehend.
Consider the following example:
Original : In approaching the resin coated male dummies with larger claws and with raised claws (vs. claws in the resting position), a strong preference for the larger and raised claws was shown by female fiddler crabs in the study.
Revised: Female fiddler crabs that approached resin-coated male dummies in the study strongly preferred males with larger claws or raised claws over those with smaller or resting claws.
Linguists contend that readers expect writers to begin with concepts both readers and writers understand (the “given”) and then to add elaborating details or new information (the “new”). When writers break this contract by introducing new information that is not linked to shared understanding, the reader must hesitate, extrapolate or infer meanings, and risk misunderstanding.
Figure 1 was taken from a student paper in Introductory Biology at Rice University. In this paragraph, the writer discusses the primary finding of research on how the Hawaii amakihi bird persists in its habitat despite the introduction of infectious disease to the area. The arrows in the text demonstrate how "new" (later) information elaborates on already "given" (earlier) phrases.
Help students look for the pattern of "given" and "new" concepts in the articles they read. These patterns will help them understand how the argument is organized. If the pattern is broken, it will help them figure out why they are having difficulty following the authors.
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