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To classify means to divide something into groups or categories. The classification is normally made according to one or more criteria. It is often necessary in academic English to classify something you are writing about in order to make comparisons and draw conclusion. This page gives information about how to classify and language for classification.
When classifying something, it is important to understand what criterion (or criteria, if there is more than one) that you are using to divide the thing into different groups. There may be more than one way to classify, and you will need to choose the criteria which make most sense for what you are writing about. For example, if you were to classify students in a university class, they could be divided according to any of the following criteria:
Classifying according to gender would divide the students into 'male' and 'female'. Dividing according to age is more complex, as you may need to specify age ranges, for example 'between 18 and 21', 'between 22 and 25', etc.
The language used for classifying depends on whether you are describing the criterion or the result of applying the criterion. Compare the following examples.
The phrase 'according to' shows that you are talking about the criterion, while the word 'into' shows you are talking about the result. The following are further examples of language for classification using a criterion.
The following are further examples of language for classification showing the result.
It may be necessary to classify when there is no name for the criterion you are using. For example, you may wish to divide a group into Asian and non-Asian students, but there is no category 'Asian-ness' which you can use as your criterion. In this case, you can use the construction 'according to whether... or not' to define the criterion. The language for stating the result is the same. See the following examples:
Finally, it may be necessary to sub-divide, that is, to divide something which has already been divided. In this case, use 'sub-divided' for the second classification, and 'further sub-divided' for the next. See this example:
According to this classification, we will end up with eight groups: Asian males under 25, Asian males over 25, non-Asian males under 25, etc. This is summarised in the following diagram.
Below is a checklist for classification. Use it to check your own writing, or get a peer (another student) to help you.
|The criteria for classifying are clear|
|The language for classifying is accurate (e.g. 'according to' to show the criterion, 'into' to show the result)|