First, it is important to remember that the word “critical” has positive as well as negative meanings.
You can write a critical essay that agrees entirely with the subject. The word “critical” describes your attitude when you read the article or chapter of the book, for example. This attitude is best described as “detached evaluation,” meaning that you weigh the coherence (is it logical or consistent) of the reading, the completeness of its data, and so on, before you accept or reject it.
A critical essay or review begins with an analysis or exposition of the article or chapter. Each analysis should include the following points: