Most technically orientated students are never exposed to lessons in effective technical writing skills. Yet, knowing how to express oneself properly is a necessity in today's technical world. The technical writer must use correct grammar and exact language in his descriptions of precise, technical subjects. He must learn how to adapt his personal style to the impact he wants to make. In addition, he must also learn how to communicate to various levels of audiences, for not all of his readers will possess the same knowledge about a subject. Also, he must learn to use graphic aids in the presentation of an article.