CHAPTER ONE
INTRODUCTION
1.1 Background of the Study
We live in an age that is experiencing an ever-increasing use of computers in diverse areas of human endeavor. Computers oer great assistance in decision-making, operations control, modeling, simulation, automated manufacturing etc. The history of development shows that so far, no industrialized nation has been able to make it without the use of computers (Inyama, 2006). In education, computers are used in extremely versatile ways to aid the understanding of a wide variety of students. Computer science as a feature in secondary school curricular has been faced with some challenges. Over the years, students` response to computer science especially in public schools has been poor and the reason seems to be that instructional materials specifically audio-visual materials may not have been used or properly utilized during instruction and this is a source of worry to the researchers considering its possible eects on students’ achievement in the subject. This stated problem has oen been attributed to the eects of the use of instructional materials, specifically, (audio-visuals). Meaningful learning is most likely to occur when information is presented in a potentially meaningful way that the information conveyed is made or presented in a way that the majority of what was taught remains permanent in the learners memory. Webster’s Encyclopaedia Unabridged Dictionary of the English Language defines Audio-Visual Aids as “training or educational materials directed at both the senses of hearing and the sense of sight, films, recordings, photographs, etc. used in classroom instructions, library collections or the likes”. The term has also been defined by Dike, (2011) as; those materials which do not depend solely upon reading to convey meaning. They may present information through the sense of hearing as in audio resources, sight, as in visual resources or through a combination of senses. Indeed, the variety of such resources is a striking characteristic.
According to (Anzaku Francis, 2011) “the term audio-visual material is commonly used to refer to those instructional materials that may be used to convey meaning without complete dependence upon verbal symbols or language”. Thus according to the above definition, a text book or a reference material does not fall within this grouping of instructional materials but an illustration in a book does. Some audio-visual components are in the nature of process and experience, for example, dramatizing an event or a procedure or making diorama. Some of the audio-visual materials like the motion pictures require the use of equipment to release their latent value. Some do not need equipment at all like an exhibit or a study print. This term designates in common usage both material things as well as processes such as field trips. Anzaku further stated that audio-visual materials include materials and equipment alike, that materials are considered to be system, or body of content of potential value when put to work, while equipment or instructions, often referred to as hardware, components, are the means of presenting such content. The importance of audio-visual materials in the teaching and learning processes cannot be over emphasized. Below are some of the roles of audio-visual materials. Basing learning in sense experience, Extending experience ,Encouraging participation, Stimulating interest ,Individualizes instructions, Serves as a source of information, Making leaning permanent, Basing learning in sense experience: stressing the importance of audio-visual materials, ( Ngozi, Samuel,and Isaac, 2012) unanimously agreed that audio-visual materials are very important and useful in education because, the normal learner in so far as the functions of his preceptor mechanisms are concerned, gains understanding in terms of multiple impression recorded through the eye, ear, touch and other series.
This is to say that audio-visual materials are the equipment through which that function can occur, that is does not occur in isolation, rather through a balance pattern from any preceptor mechanism that are stimulated by external occurrences. Swank, (2011). stressing the effectiveness of visual materials in leaning, estimated that about 40% of our concepts are based upon visual experience, 25% upon auditory, 17% on tactile, 15% upon miscellaneous organic sensation and 3% upon taste smell. With the above assertion, it becomes clearer why audio-visual materials are important in the teaching and learning processes. This is because, they bring the dierent senses contributions together to get 100% clarity. Extending Experience: Gopal, (2010) stressed that audio-visual materials help the teacher to overcome physical diiculties of presenting subject matter. That is to say, with audio-visual materials, the barrier of communication and distance is broken. The culture and climatic conditions of other countries can be brought into the classroom with the aid of slides, films, filmstrips and projectors.
This is important because, according to Dike, (1993) “once the phenomenon is visualized, the picture and knowledge becomes very clear and permanent”. Agreeing to this assertion, a 20th century Chinese philosopher stated that “one picture is worth a thousand words”. Encouraging Participation; Natoli, (2011) once again added that “audio-visual materials are rich opportunities for students to develop communication skill while actively engaged in solving meaningful problems”. In other words, students certainly like it more and learn better if they are engaged in important and appealing activities. For example, involving students in bulletin board display will enhance their choice of colour and aid their understanding of the concept in question or when they join the teacher in dramatization of an event or a process. Stimulating Interest: According to Katherine (2009) “learning takes place eectively when the teacher sets out to provide learning situation in which a child will learn because of his natural reactions of the provided materials”. During the process of learning, the teacher has to provide the learning situation to satisfy the natural reaction of the learner and this is through the use of instructional aids. The attention of the learner is caught and his interest is also won and he is ready to learn. Fawcett Hills (1994) also contributing on the role of audio-visual materials in stimulating interest stated that “A friendly, accepting group climate is important in any learning situations, especially those materials that require students to reveal their ignorance and confront their fellow students”.
When there is a climate of acceptance for learning, then learning is stimulated. Individualized Instruction: Lestage, A. (2009) stressed that audio-visual materials provide a means of individualizing instruction. This he said is possible through programmed learning and tapes which enable the learner to learn at his pace and also to work on his own. Moreover, according to Dike, (1993) the machine frees the teacher to work with individual students, since he or she is not now required to carry out routine drills. Production of resources by students is another way of individualizing instruction. Making learning permanent :Audio-visual resources can play a major role of making learning permanent, Gopal, (2010) stressed that “audio-visual methods do seem to facilitate the acquisition, the retention and the recall of lessons learned, because, they seem to evoke the maximum response of the whole organism to the situations in which learning is done. And perceptual materials readily associate themselves with the unique experiential background of each individual. (Natoli, C. 2011) stressed that audio-visual materials are important in the teaching and learning processes because “Having seen something, most people remember, for whatever that thing was, it conjures up an image at a mere mention and can be talked about freely. Dike N.M (2011) also explained that students forget because of lack of interest and opportunities to use the knowledge they have gained later on. Audio-visual resources can therefore contribute to the clarity of information presented by allowing students to visualize what is learned. Thus the saying Natoli,(2011): What I hear, I forget, WhatI see, I remember, What I do, I know. Therefore, it is extremely important to investigate the effects of the use of audio-visual materials on students’ achievement in computer education
