Precision is achieved, to a certain extent, by using the precise terms which describe different phenomena, such as the words that are specific to the field, or technical terminology. It is important to consider the reader, and how much knowledge he or she has of the field. Sometimes it is necessary to define the words you are using; however, you are still allowed to use them. Precision is also achieved through a consistent use of concepts. As a writer, it is easy to feel that the text is too repetitive and thus feel like substituting some words with synonyms. Do not replace the key concepts. For example, if you have conducted an interview and you have decided to call the participants "informants", you should refer to them as such throughout the entire text, even if you would like to call them "interviewees" or "patients" for the sake of variety.