Here are some strengths, limiations and preparation as you prepare a lecture in place of your professors.
STRENGTHS: 
- presents factual material in direct, logical manner 
- contains experience which inspires 
- stimulates thinking to open discussion 
- useful for large groups 
LIMITATIONS: 
- experts are not always good teachers 
- audience is passive 
- learning is difficult to gauge 
- communication in one way 
PREPARATION: 
- needs clear introduction and summary 
- needs time and content limit to be effective 
- should include examples, anecdotes