General Statement: You will start with briefly introducing your article's topic. You have to encourage the viewer that the subject will soon be of his interest also, and he'll benefit from its reading. So you must strictly stick to the subject, and don't try and answer to many questions while in the same essay. So that he is able to quickly determine the soundness of your composition, the viewer will always be curious to understand your methods.
You have to influence the viewer that the topic will be of his awareness too, and he will take advantage of its reading. Which means you and the subject must strictly stick together, and don't try and response to several queries in the same article. To ensure that he can easily ascertain the soundness of one's dissertation, the audience will always be curious to understand your assets.