The lecture is the most efficient way to deliver information to a large group. No guarrantee knowledge is imparted, if that implies knowledge is received. We must remember that the listener is res- ponsible for what is learned/retained. The lecturer is distanced from the action occurring in the audience, whether it be learning, note taking, retaining.
A teacher takes on many roles, only one of which is imparter of wisdom. Sometimes it is co-inquirer, sometimes it is hypothesis generator, sometimes it is discussion leader or debater, sometimes it is doubter that needs to be convinced. It is in these later roles that the teacher becomes personally involved in the learning process -- which is still the responsibility of the learner.
It is a talent to be able to deliver a good, interesting, exciting lecture. Unfortunately, most of us do not have the talent or put the required effort into developing such a lecture. I hardly catagorize most classroom lectures in this category -- but, hey, you never know. Eileen Schoaff Bflo State