A good paragraph, in a research paper, is expected to contain just one idea which is developed through supporting information. In the UK, the preference is that the paragraph be developed after stating the main point early. This is the deductive style of writing as opposed to the inductive style in which the preference is to move from the general to the specific.
Writers should use sentences that are neither too long nor too short. A paragraph that is full of short sentences conveys the impression that the writer is not connecting his ideas in meaningful ways. There is also a lack of flow in the writing when too many short sentences are used. If a writer detects far too many short sentences in a single paragraph, he should try and combine some of the sentences in ways so that the new sentences thus formed remain coherent.
However, a sentence can sometimes be overly long which makes the statement complicated and difficult to follow. If a writer comes across such a sentence, he should try and break it down to an appropriate number of shorter sentences.
Using sentences of varying lengths makes the writing more lively and reader-friendly. The writer needs to keep this in mind at all times and use a mixture of sentence lengths. That said, it doesn’t mean writer use a sentence that is overly long or lots of short sentences in the sequence.
Repeating the same words and phrases is considered to be a poor style of writing. Of course, it is inevitable that some key nouns will be repeated. One way to avoid repeating words and expressions too often is to use synonyms. Another way is the use of grammatical substitution which means replacing one grammatical item for another - for example, replacing a noun with a pronoun.
Finally, writers are required to avoid labouring on a point which means adding unnecessary details or spending too much time trying to explain a point.
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