It develops a sound argument with tested claims and it arrives at a reasoned judgment about the matter at hand. The thesis expresses the goal, purpose of the essay. Whenever we reasons, we reason to some end, to achieve some objective, to satisfy some desire, or fulfill some need. One source of problems in our reasoning is due defects in our purpose or thesis. Carrying through on the thesis requires making sure the essay remains on target and developing the primary thesis.
Concepts are ideas or thoughts, especially a generalized idea of a thing or a class of things.
Thus we must learn how to identify the concepts or ideas we are using, contrast them with alternative concepts, and clarify what we include or exclude by means of a concept. Clarity is a fundamental perfection of thinking and a crucial aim of critical thinking. Strong critical writing identifies each concept that is needed to explore the problem at hand, to support the argument or develop the thesis. Each key concept is defined clearly Showing the implications of the definition. Do not assume that because you 'know' what a concept means that your understanding is clear, precise, coherent, or even correct.