University lecturers have little opportunity to wing it when they stand and deliver a lesson in a packed lecture hall. Start with an in-depth knowledge of the subject, and practice recalling facts and figures seamlessly without referring to notes. When delivering a lecture on the American Revolution, for example, use the names and dates of particular battles to provide a detailed understanding, not just a cursory overview.
A lesson is more memorable if a university lecturer can manage to work in an anecdote or colorful example to personalize an event or illuminate a matter. An interesting tidbit can be humorous and reveal underlying truths, versus a mere textbook rendering of a lesson. This skill is important to discourage passivity.
Nothing is more exasperating than listening to a lecture that is monotonous in pitch and tone. Speaking in a deadpan voice is sure to invite doodling, rather than active note-taking. Be animated and enthusiastic about the subject. Good public speaking skills with a emphasis on a strong delivery are paramount.
React to the cues the students are sending through their facial expressions and body language. Encourage questions, and be prepared to change directions midway through the lecture. A sought-after lecturer, like a stand-up performer, has good people skills and can read the reaction he is receiving.