[1]A CRITICAL APPRAISAL OF THE ROLE OF LABORATORY PRACTICAL WORK IN SCIENCE TEACHING IN NIGERIA

 

BY

 

ISAAC OLAKANMI ABIMBOLA

 

 

Abstract

 

The purpose of this paper is to sensitize science teachers and educators on the need to rethink the traditional role usually accorded laboratory practical work in science teaching. The historical evolution of the use of laboratory work in science teaching it-as traced to the early scientists. Then, the paper examined how the laboratory method first found favour with some science educators and how others later experienced disillusionment. Some initial suggestions were made that could replace or minimize the use of the laboratory method of teaching science.

 

Introduction

The use of the laboratory method of teaching science has become a dogma among science educators and teachers. On the one hand, they extolled the importance of the use of the laboratory method in science teaching while on the other hand, they only pay "lip service" to its use in practice. Science teachers do not usually find it convenient to make laboratory work the centre of their instruction. They usually complain of lack of materials and equipment to carry out practical work. At the same time, it is possible that some of these materials and equipment may be locked up in the school laboratory store without teachers being aware of their existence. The conditions under which many teachers function do not engender any enthusiasm to use the laboratory method of teaching science even where they know that these materials and equipment are available. Class size in urban schools is getting larger and this does not usually encourage teachers to use the laboratory method to teach science. In some states of the country, teachers go for months without salary owing to shortage of funds. Science teachers who fall in this category cannot reasonably be expected to give off their best to their students.

Higher institutions in Nigeria charged with the responsibility of training science teachers at all levels, are increasingly turning out teachers without requisite laboratory experience. A common reason usually given is shortage of laboratory facilities. Such trained science teachers usually lack the necessary confidence to conduct practical classes with their students. It is only accreditation exercises that are improving this situation in Colleges of Education and Universities at present.

Such governments see, to have given up on their capacity to equip all school laboratories. They have therefore resorted to designating selected schools as "science schools" that they equipped with their meager resources. They usually used the traditional help received from the Federal Government in equipping school laboratories for these science schools. The condition of the national economy continues to deteriorate without any sign of improvement in sight. Is it not time to get realistic with our science teaching? I think it is high time we started.

The purpose of this paper is to sensitize science teachers on the need to look for alternatives to the traditional laboratory method of teaching science. First, I traced the historical evolution of the use of laboratory work in science to the early scientists' use of the experimental method. Second, I searched for answers to the question of why science educators think that the laboratory method should take a centre stage in science teaching. Third, I then provided evidences to illustrate, what I consider, a quiet disillusionment among some science educators concerning the role of laboratory work in science teaching. Fourth, I affirmed that the disillusionment is real. Then, I made some suggestions that could free science teachers and examination bodies from the dogma of laboratory work.

 

Origins of Experimental Science

The use of laboratory method in science teaching originated from the ideas of early scientists. The l7th Century is very significant in this respect. Mendelson (1982) has characterized the Century as the century of "The Scientific Revolution." This characterization is so because, according to Westfall (1971), "it was in the 17th Century that the experimental method... became a widely employed tool of scientific investigation" (p.115). The general feeling of disillusionment among scientists with earlier methods precipitated this trend. (Butterfield, 1957; Westfall, 1971). The feeling of disillusionment had to do with results of scientific investigations that did not match the efforts put into them. The scientists of the time blamed the method of conducting science, for the low output.

Taylor (1963) claimed that "the idea of experimental science began to have influence about 1590" (p.90) when scientists started basing their work on deliberately contrived experiments. According to him. "Galileo Galilei (1564-1643) was the first to employ the modern scientific method in the fullness" (p.91) in physics and astronomy. Before then, Westfall (1971) stated that Galen's writing on physiology contained examples of experimental investigation. Westfall also claimed that Robert Grosseteste of the medieval school. and the logicians based at the University of Padua, Italy, in the l6th Century, also discussed the precursors of hypothetico-deductive method.

However, it was in the 17th Century that scientists paid the greatest attention to the scientific method that led to a revolution in science. The sheer number of persons that paid attention to method then indicated the need for an acceptable method of conducting science. Francis Bacon (1561-1626) was perhaps the first in the 17th Century to formulate a series of steps to account for the scientific method in his hook Novum organum (The New Instruments, 1620), (Taylor, 1963). The book was a reaction to Aristotle's treatise in logic referred to as Organum. Bacon based his method on the inductive method of objective observation and experimentation without any preconceptions. Rene Descartes' (1569-1650) Discourse on Method based on mathematical reasoning and deduction closely followed Bacon's book. Westfall (1971) has credited Robert Boyle with perhaps the best statement of the experimental method that focused on "the activity of investigation that distinguishes the experimental method of modern science from logic" (p. 115). Pascal, Gassendi, and Newton also wrote on scientific method (Westfall, 1971). The emphasis on method during this period paid off with the several discoveries and inventions in the 17th Century and beyond, thereby giving the impression, albeit unintentionally, that science is synonymous with its method.

 

Importance of Science Practical Work

In Shulman and Tamir's (1973) review of research on science teaching, they identified three rationales generally advanced by those that supported the use of the laboratory in science teaching. The rationales included: (1) The subject matter of science is highly complex and abstract, (2) Students need to participate in enquiry to appreciate the spirit and methods of science, and (3) Practical work is intrinsically interesting to students. Shulman and Tamir also compiled a list of objectives of using laboratory work in science teaching. The list included the teaching and learning of skills, concepts, attitudes, cognitive abilities, and understanding the nature of science. Also, there is hardly any science method's book that does not usually list the objectives of science laboratory work (see, Abdullahi, 1982; Collette & Chiappetta, 1984). All science curricula in Nigeria list practical activities that should go with each curriculum item listed. The current West African Examinations Council (WAEC) syllabus (WAEC, 1988) in use in 1996, recommended that the teaching of all science subjects listed in the syllabus should be practical based, perhaps, to demonstrate the importance it attached to practical work in science. Thus, several decades of emphasizing the assumed importance of laboratory work in science teaching have elevated the importance to the level of a dogma. Thomas (1972) and White and Tisher (1986) are of this opinion. This position is, perhaps, why Yager (1981) thought that science educators should treat laboratory work as the "'meal'-the main course" (p. 201) rather than an "extra" or "the desert after a meal" (p.201). Also, Bajah (1984) said, "All science teachers and students know that practical work is the 'gem' of science teaching" (p.44).

This dogma about the importance of laboratory work originated from the views of a few American educationists in the early sixties that extolled the importance of laboratory work in science teaching. Notable among these personalities are Bruner (1961), Gagne’ (1963), and Schwab (1960), They all extolled the virtues of teaching science as a process of inquiry or discovery. Before them, Dewey (1938) advocated learning by doing through his "project method" that he considered as a method of organizing the school curriculum on a scientific basis. Another American, Charles Pierce (Peirce, 1877, 1958) who advocated the use of the method of science as a mode of inquiry to satisfy our doubts, in turn, influenced him. The ultimate goal of these advocates of practical work was to train students in the ways of practising scientists so that students could become good scientists in the future. The surprise by which the former Soviet Union took the Americans, and, perhaps, the world, in launching the Sputnik into space in 1957, motivated their positions. Emphasis in science teaching at this time shifted from the products of science, what science to teach and learn, to the processes of science, i.e., how we teach and learn science (Bates, 1978). According to Shulman and Tamir (1973), this shift in emphasis lacked empirical evidence because the influence of the educationists mentioned above formed the basis of the shift. As a result of this influence, and the need to match the Soviet feat, the Americans commissioned and executed several curriculum development projects. Such curriculum development projects included the Biological Science Curriculum Study, started in 1959-, Chemical Bond Approach, started in 1958, Physical Sciences Study Committee, started 1956, and Science: A Process Approach, started in 1967, etc. They were all laboratory based. These curriculum development activities, with emphasis on laboratory work, spread to Nigeria, and elsewhere in the world.

 

Doubts About the Importance of Laboratory Work

Research into the role of laboratory work in science teaching has a long history. Blosser (1981) put the beginning date at the 1930's. These research efforts into the role of laboratory work in science teaching reached, their peak in the 1960's and 1970's during the curriculum development years. Abimbola (1981), Bates (1978). Blosser (1981, 1983), and Shulman and Tamir (1973) carried out reviews of research in this area. All of them concluded that science education researchers failed to provide conclusive evidence to support the view that using the laboratory method of teaching science is superior to other methods, at least, as measured by paper and pencil achievement tests. This conclusion is perhaps what prompted Leonard (1981) to exclaim that "Laboratory instruction is on trial" (p.445)- Also, the 1980-81 Board of Directors of the National Science Teachers Association (NSTA) in the U-S- recognized that there were widespread doubts about the importance of the laboratory in the seventies (Klein. Yager. & McCurdy, 1982), The Board thereafter put out a position statement in support of laboratory method of teaching science as follows:

The National Science Teachers Association endorses the necessity of laboratory experiences for teaching and learning in science. Adequate support for materials, equipment, and teacher time is available for schools to maintain quality science instruction. Such a quality program is critical in today's age of science and technology (Klein, Yager, & McCurdy, 1982, p.20. (emphasis in original)

Also, the Board commissioned various persons to write position statements to support the use of laboratory work at different levels of education and all the position statements appeared in one issue of The Science Teacher 49(2), 20-23. For instance. Tafel (1982) wrote for the Middle/junior School; Perez (1982) wrote for the high school; Bybee (1982) wrote for the "Basics" movement; Lunetta (1982) wrote from the curriculum perspective; Hurd (1982) wrote from the teaching perspective and Bates (1982) wrote from the research perspective.

The purpose of this section is to briefly provide examples of conclusions from the reviews mentioned above, part of which generated the reactions of the Board of Directors of the NSTA. For instance, in Abimbola's (1981) review of conceptions of discovery in science held by educators and philosophers of science, he concluded that the conceptions of discovery in science held by major schools of philosophy of science then, did not influence the "teaching by discovery" and "discovery learning" slogans. According to him, "the studies reviewed provided little elucidation about the efficacy of the discovery method of teaching and learning (p. 103). The discovery method of teaching and learning has as its main focus, the use of laboratory work in science teaching and learning.

Bates (1978), too, in a review of the role of the laboratory in secondary school science programs, concluded that despite seventy five years of studies in this area, the consistent conclusion is that "laboratory experiences neither help nor hinder student achievement - at least as measured by standard paper and pencil tests of subject matter" (p.68). Specifically, he found, among other things, that "lecture, demonstration, and laboratory teaching methods appear equally effective in transmitting science content" (p.74). Nonetheless, he found laboratory experiences to be "superior for providing students' skills in working with equipment" (p.74) and in maintaining students' interest in science. These are important objectives to achieve in science teaching and learning. However, how many of the skills acquired from laboratory work do students use in real life situations? Put differently, how does the lack of possession of these skills adversely affect the functioning of individuals in their daily life activities?

Shulman and Tamir (1973) upheld some of Yager, Englen, & Snider's (1969) conclusions about the need to question the central role of the laboratory in science teaching. They thought that science teachers could obtain desirable learning outcomes with limited laboratory experiences. Also, they concluded that, a verbal, non-laboratory approach might be best for some teachers and students. Some students may find laboratory activity a sheer waste of their time. They finally emphasized the need to structure some new courses that would deemphasize laboratory work without de-emphasizing the nature of science. We can achieve this restructuring of courses by giving equitable attention to the teaching of science concepts and principles, science process skills, and scientific attitudes without over emphasizing one over the others that was the case in the science programmes of the sixties and seventies. All this goes to show that the disillusionment is real.

In any case, studies in Nigeria and abroad have shown, too, that this disillusionment is real. For instance, studies have shown that science teachers themselves did not attach much importance to laboratory work as they usually found the slightest excuse to avoid them. However, if they attach importance to it there is no research evidence to support this importance (Abimbola, 1988; Bajah, 1984; Daramola, 1982, 1985, & 1986; Ndu, 1980: & Weiss, (1978). Important evidence, at least in Nigeria, that many science teachers are either not doing practical work at all or not doing enough practical work to give their students the confidence that they would pass their Senior School Certificate Examinations in science, is the extra-mural laboratory class being established in urban centres in Nigeria. Students that attend these classes must be missing something in their school laboratory work that they think they can find in the extra-mural classes. Also, the importance attached to laboratory activities did not match government provision of laboratory materials and equipment because they arc expensive to buy. There is therefore the need to explore alternatives to laboratory activities that would still preserve the nature of science.

 

Alternatives to Laboratory Work

Continuing to accord a central role to laboratory work in science teaching does not seem reasonable and feasible any more in the developing countries. I therefore intend to explore some alternatives to laboratory work for science teaching. Teachers that cannot do away with laboratory work can record on video tape well-planned demonstration experiments that they can later show to their students at appropriate times, Modern day secondary school students are likely to enjoy watching a video recording than carrying out laboratory work. This practice would save teachers and administrators some money and effort because it requires a one-time investment of money without further expenses on many consumable items.

Most traditional laboratory activities are gradually being banned in the developed countries either because of their health hazards or because of special interest groups. For example, animal dissection that used to be the core of biological experiments is gradually being phased out because of the influence of animal right activists, despite the spirited defence of animal use in the guidelines issued by the National Association of Biology Teachers (1980). The introductory statement of the guidelines goes thus: "Living things are the subject of biology and their direct study is an appropriate and necessary pan of biology teaching" (p.426). Computer simulations of dissection experiments are gradually becoming popular with schools. Interactive computer activities are gradually replacing laboratory experiments, thanks to the evolution of multimedia computer programs. Computer programs are also available for problem-solving exercises in the major sciences. The acquisition of computers by schools requires a one-time investment of money. The computers are also useful for other purposes apart from being used as an alternative to actual practical work. Computer simulations can only approximate the real feeling of working with live animals. However, for the knowledge gained by students from such an activity, the difference between the two activities is not likely to be significant.

The West African Examinations Council has already tried the "alternative to practical" form of examination with the Ordinary Level G.C.E., without many complaints. This form of examination requires candidates to answer questions on laboratory practical work off hand without having to do any laboratory work involving concrete specimens. This form of examination has not only saved the Council much money on the administration of laboratory practical examinations, it has also saved it time and effort usually expended on such examinations. Since most science teachers teach most practical lessons by the lecture method, they can go an additional step by examining their students using an "alternative to practical" method. My proposal is that if students listened and understood the teacher's lesson, they should be able to pass such examinations very well. The West African Examinations Council could therefore extend its "alternative to practical" examination method to all its otherwise laboratory practical-based examinations.

Bloom (1956) has said that most of the subject matter content of most disciplines is informational. That is, the content involves the teaching and learning of basic concepts, laws and theories related to that discipline. The objective stated for any unit of instruction has been found to be generally in the ratio of the cognitive domain, 50%; the psychomotor domain, 25% and the affective domain 25%. If this proportion is so, and if students are able to master the cognitive component of their lessons, it should have transfer value on the affective and psychomotor domains. Abimbola & Danmole (1995) have recommended the use of content analysis method by concept maps to help students to understand the conceptual knowledge in science. Abimbola (1996) has also recommended the use of concept maps in constructing some of the items in nationally conducted examinations. Since teachers use some laboratory activities in science to elucidate what they had taught in science classes, if their students can achieve proper understanding of concepts and principles by using concept maps or other means, will the same goal of elucidation not have been achieved in a cheaper and perhaps, more effective way?

 

Conclusion

I have attempted in this paper to take a critical look at the traditional importance usually associated with the use of laboratory %work in science teaching and to question whether the status quo should continue. First, I traced the origin of laboratory work to the 16th Century and how it blossomed in the 17th Century thereby causing a scientific revolution. Second. I provided information on why educators, and science educators, in particular, usually think that laboratory work is crucial in the teaching and learning of science. Third, I provided evidences that I thought caused some science educators to doubt whether the usual importance ascribed to laboratory work in science teaching is not misplaced. The assertions of importance do not carry corresponding evidential support- In fact, results of some of the studies seemed to suggest that the use of laboratory work in science teaching did not make much difference in students' learning outcomes. Finally, I made some preliminary suggestions about what science teachers could use in place of laboratory work that would still preserve the nature of science and improve students' achievement in science.

 

 

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___________________

The Author

Dr. I. O. Abimbola is a Senior Lecturer in the Department of Curriculum studies and Educational Technology, University of Ilorin, Ilorin. Nigeria.



[1] Journal of Curriculum and Instruction, 4 (1&2), pp.59-65, 1994.