Workers in this unit group conduct classes, deliver lectures, tutor and instruct students in courses at the third level of education. Their functions include: conducting courses of instruction at the third level by means of lectures, demonstrations and supervision of students' laboratory and other practical work, setting and marking examination papers and performing related tasks, generally specialising in a particular subject within such fields as physical sciences, engineering, life sciences, medical sciences, mathematics, economics, law, theology, education, fine arts or agriculture, or conducting third-level courses in applied science or technology; providing similar instruction by private lessons.