The effective organization and presentation of lecture material is described. Because the average lecture takes 40-50 minutes, it needs to be planned and structured in advance, since the lecturer's instinctive ordering of points may not be the best way for students to receive them. The material should be organized first for the course as a whole and then for each lecture. Thought should be given to where and when there should be pauses, the order of presentation, and the distribution of emphasis. The lecturer must also consider order, content, transitions, and making connections. Making sense to students requires skills in presenting information and expounding ideas--for example, how to make a point and the use of definitions and summaries. The lecturer can use a number of ways to open up a topic: explaining, illustrating, and reinforcing meanings. The actual delivery of the lecture involves setting, atmosphere, and style of address. This style may involve lecture notes, writing on a chalkboard, use of audiovisual equipment, and gesturing. An important part of lecturing is the active two-way communication that occurs with students. Eight suggestions for determining the success of a lecture are offered. (SW)