Thesis statement
In an essay or research paper, a thesis statement is a statement at the start or the end of an introduction that shows the reader the argument of the essay. A thesis statement gives concise information about what the whole essay is about, including the topic of the paper. It is usually just one sentence but it may have more than one sentence. The thesis statement is explained further using body paragraphs. Thesis statements are not obscure, because obscurity happens when a "writer himself is not quite sure of his meaning.  He has a vague impression of what he wants to say, but has not, either from lack of mental power or from laziness, exactly formulated it in his mind, and it is natural enough that he should not find a precise expression for a confused idea.” (W. Somerset Maugham). Clarity and unity of a thought in an essay flows from a good thesis statement. Rubrics of a good essay involve good sentence development and formation acceptable to grammatical standards and relevant word choices organized in forms of phrases, clauses and sentences.