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Chapter 19Lecturing and ExplainingOverview Objectives of the lecture methodEmpirical Evidence on the effectiveness of LecturesComparasions of the Lectures method with other MethodsThought Processes in LecturesProper Uses of LecturesPreparation for LecturingThe Introduction to the LectureEstablishing Teacher-Students RelationshipsGaining Student AttentionMaking Reasonable Assumptions About Students’ Interests Providing Motivational Cues Exposing Essential ContentAdvance OrganizersPrestesting and Prompting Awareness of Relevant Knowledge or ExperienceRecap The Body of the LectureCovering the ContentProviding a Logical OrganizationComponent (Part-Whole) RelationshipsSequential RelationshipsMaterial to purpose (Relevance) RelationshipTransitional, or Connective, RelationshipsThe Comparasion Combination DevicesA Model for Organizing ExplainationsMaking the Organization ExplicitExplicitnessThe Rule-Example-Rule TechniqueExplaining LinksVerbal “Markers of Importance”The Stuctural SupportMaintaining AttentionVarying the stimuliChanging Communication ChannelsPhysical ActivityUsing HumorShowing EnthusiasmQuestion Inserted into LecturesNote-takingHandouts Being ClearExamplesAvoiding Vagueness TermsThe Conclusion of the LectureFunction of the ConclusionInterlecture StructuringCaution About the Lecture MethodSummaryOverview A great deal of teaching still takes the form of solo performance. When Lecturing, explaining, pointing out relationships, giving examples, or correcting errors, teachers often launch into monologue. From one student to a few hundred may be present to see and hear you for anywhere from 30 seconds to 60 minutes. Are you emotionally ready for this kind of attention from your students? Are you prepare to instruct them as well as posible? Do you know how to establish rapport with them? Can you motivate them to pay attention to what you are saying? Can you organise your thoughts coherently, and should you share that organization with your students? Are you able to conclude your solo performance so that more learning and higher student satisfaction will occur? This chapter on lecturing and explaining should help you in dealing with these problems. You will now learn about both lectures (the relatively long, uninterupted, formal discourses frequently used by the college or university teacher) and explainations (the shorter discourses, lasting, say, 30 seconds to 5 minutes, heard frequently in smaller classes or those below the college level). We deal in turn with the objectives of the lecture method, the lecturer’s preparation, and the ways in which he or she should give the introduction, body, and conclusion of the lecture.
OBJECTIVES OF THE LECTURE METHOD
Samuel Johnson, the great English literary figure, was quoted in 1799 by his biographer James Boswell as saying “ Lectures were once useful; but now when all can read, and books are so numerous, lecturers are unnecessary. If your attention fails, and you miss a part of lecture, it is lost; you can not go back as you do upon the book” (Boswell, 1799; 1953). The point has often been made.
McLeish (1976) reviewed criticsms over several centuries. Lectures have been critized as being anachronisms since the invention of printing, as permitting the passivity of listeners, and as limiting the student to note taking, instead of bringing students into more active contact with their curricula. It is nnot unusual to read such items as a student’s editorial about “our absurd lecture system” (Stanford Daily, April 19, 1963, p.2) or “twenty five Harvard medical students say their lectures are dull and a waste of time” (Associated Press, January 31, 1966),or a lament that “only a very small number of students ever spoke or raised questions” (Stanford Daily, January 7, 1981, p.4).
But lecturing has also been defended as valuable in surveying a whole field of knowledge through the medium of living personality, in relating this body of knowledge to the primary aims of life, and in arousing active interest that leads to comprehension on the part of the student. Many students do not learn effectively through reading, and the lecture can introduce them to the subject matter. The lecturer can repeat material in different words when necessary, whereas books can provide only one wording of explaination. Complex materials, especially the most recent ones that are not yet incorporated into textbooks, can be set forth efficiently in lectures. Lectures can compensate for the overabundance of books in some fields and the lack of books in others. The lecturer can give a frame work, overview, and criticism unlike that found in any available printed material. The lecturer can provide aesthetic pleasure and communicate enthusiasm to a far greater degree that can the printed page, just as seeing and hearing a play have advantages over readingit. Lectures can be better prepared and more carefully planned than the extemporaneous remarks made to students in a discussion (the Hale Committe, cited in McLeish, 1976, p.258).
So it may be difficult to say anything new for or against the lecture method. One intriguing question is. Why has the lecture method persisted despite shortcomings that have been evident for centuries? The answer may be found in administrative factors rather than in learning and teaching factors. First, the lecture method is cheap because the number of students per teacher can be extremely large. Second, the lecture method is flexible since it can be readily adapted, on short notice, to a particular audience, subject matter, time limit, and set of equipment. The lecture method can also be adapted to the teacher’s schedule to a degree that printed and programmed teaching materials do not allow. Teachers cannot always plan ahead sufficiently to have materials run off on duplicating machine. Sometimes sheer in efficiency, of an all-too-human kind, prevents teachers from putting on paper and getting printed exactly the selection of ideas, from many sources and in a hitherto unprinted form, that they wish to present. No teaching method so adaptable will disappear in favor of methods that require more rigorous planning and usable only with certain kinds of proups, subject matter, time intervals, or equipment ( that is, projectors, books, audio or vidio record players, or computers).
Futher, the lecture method provides teacher and students with kind of reinforcement not available in other educational procedures. Teachers are rewarded by the attention they receive from students if they are lecturing at all effectively. So a professor of art wrote:
I enjoy the lecture method. It is the most dramatic way of presenting to the largest number of students a critical distillation of ideas and information on a subject in the shortest possible time. The bigger the class the better I perform intellectually. How else in teaching you can share with so many a lifetime of looking at and loving art? You stand on a stage in front of a screen on which the whole history of art is projected. You can be an explorer of African art, an interpreter of Greek sculptures, a spokesman for cathedral builders, an analyst of Picasso and philosopher of Sung painting. No other subject is as visually exciting in the classroom, and this is what keeps me turned on lecture after lecture, year after year. With that supporting cast and if he knew his line, who wouldn’t want to perform in front of a large audience? (Else, 1969, p. 21)
Finally, students may be reinforced by the warmth, humor, drama, intensity, logic, enthusiasm, and attention- to say nothing of knowledge and comprehension-that an effective lecturer bestows upon them. Students in the lecture hall may obtain a sense of security through being assured that their own attendance and attention are appropriate. That is, the lecture situation can tell students that they are doing the right thing at tyhe right time by being at a lecture, paying attention, perhaps taking notes, and responding with interest or boredom, in the same way that many other students are responding at the moment. The effectiveness of teaching methods is often measured by how much students learn in the form of knowledge and comprehension of a subject matter. But the lecture situation may also provide social reinforcement, aesthetic pleasure, and emotional reassurance of one’s own propriety- akind of coping with the essensial loneliness of the human condition. These may also be outcomes that account for the lecture method’s validity.
Empirical Evidence on the Effectiveness of Lectures
Despite all these possible advantages, the lecture method would probably have disappeared if experience and research had indicated that it is completely ineffective. But such evidence has not been forthcoming. Scores of experiments have been performed.
Comparisons of Lectures with other Methods in these experiments, students taught by the lecture method have been compared, on the basis of their achievement on final examination, with students taught by other methods, especially the discussion method. The overall verdict is that the lecture method is just about as effective, by and large, as the other methods. Dubin and Taveggia (1968) reviewed the data (rather than merely the conclusion) of nearly 100 studies over a 40-year period. They tallied the result of 88 independent comparasons of scores on final examination of students taught by the lecture and discussion methods, as reported in 36 experimental studies. Of these, 51 percent favored the lecture method, and 49 percent favored the discussion method. Dubin and Taveggia also examined the average scores on the final examination of students taught by these two methods. The differences averaged so close to zero as to be attributable to chance.
McKeachi and Kulik (1975) tried a different approach in examining these studies. They compared the lecture and discussion methods on thre
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