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12 The teaching of science to mixed ability groups
Curriculum and organisation
Whatever the kind of grouping, many schools are now providing a science course common to all pupils in Year 1 and Year 2 and this was true of all the schools visited which had mixed ability groups for science. Despite the expressed intention of many teachers to provide for all abilities, in the majority of schools visited there was need for more variation in the depth of treatment to take account of the different stages of development of the pupils. Thus an able pupil at a young age may readily understand the formation of copper (II) oxide from copper and of copper from copper (II) oxide and appreciate that these are particular examples of oxidation and reduction, but thought about the purpose of such work with less able pupils is needed since they may get out of it little more than the fact that changes in appearance occur.
a The variation in attainment between the most and least able becomes increasingly obvious as the pupils get older and in an attempt to overcome this difficulty many schools provide additional work for the most able. The nature of the additional work which was seen gave cause for concern since much of it was little more than unnecessary reinforcement of work already understood, or repetitions on the same theme. For example, young pupils in one class were asked to consider pictures of different animals and then to relate speed, agility and strength to skeletal structure. The most able very quickly understood the points being made but to fill in time they were asked to copy pictures of antelopes and elephants while the others finished off their notes. At the other end of the scale, few of the departments visited sought skilled help for pupils with learning difficulties.
b In science, particularly physical science, more than in many other subjects the early introduction of concepts which may be difficult is required if able pupils are to make the progress of which they are capable. For instance the concept of acceleration as a measured quantity is difficult and many 13 to 14 year old pupils cannot fully understand it; yet it is fundamental to physics. If such concepts are introduced into the third year (and to postpone them to Years 4 and 5 can overload O-level courses in these years) it is even more important for pupils to work at different rates and depths. A few of the schools visited were successful in providing suitable work for the full range of pupils in mixed ability classes but others were not. The majority taught science to streamed or setted groups in the third year.
c The schools visited usually recognised the need to differentiate between the examination or non-examination targets of different pupils in Year 4 and Year 5 although GCE O-level and CSE candidates were frequently taught together until decisions about
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their examinations were made in Year 5. In these years the teacher usually knew the pupils well and teaching group sizes were somewhat smaller. Consequently it was easier to provide work at different rates and depths. All the teachers, however, usually found considerable difficulty if less able pupils aiming at no examination were included in the same teaching group as those seeking examination qualifications. Even if individual learning methods were used, it was not easy to cope simultaneously with the pupil who enquired about diffraction gratings and the pupil who wanted help with his project on cars.
Facilities and resources
Whatever the form of organisation, effective science teaching demands well equipped laboratories and a good range of suitable reference books and audio-visual aids. For mixed ability teaching it is even more important to have plenty of resources because of the need in a given lesson to provide materials suitable for more than one level of ability and because of the greater variety and amount of experience needed by some pupils. Similarly, adequate laboratory assistance is even more necessary. Many of the schools visited had insufficient resources to aid the science teacher with mixed ability classes.
In the majority of schools visited science staffs had come to rely on work-sheets as the means of organising their teaching of mixed ability classes. HM Inspectors noted that these could be a useful aid to organisation, allowing, as they did, most pupils to start and continue working while the teacher was attending to an individual or a small group. They also made it possible for pupils of widely differing ability and experience to proceed at different rates and levels of understanding. It was, however, felt that even the best worksheets had certain disadvantages. Some pupils were either unable to read at all or only with great difficulty; some who could read found it difficult or impossible to follow and implement the instructions given on the worksheets. In almost every case the sheets prevented pupils from isolating and defining their own problems, and usually they did not allow a pupil to design and carry out his own experiments, At worst, they restricted a pupil to prescribed tasks and conditioned his thinking along fixed channels. Some demanded one-word answers and inhibited opportunities for writing extended prose. Thus instructions such as "Connect A to B, observe what happens and complete the sentence 'When A is connected to B the lamp ...'" encouraged neither thought nor literacy.
It seemed that the most successful use of worksheets was when they were supported by reference and general reading books as well as by a variety of audio-visual resources. For example one series of worksheets took the pupils through a series of experiments on different forms of energy. After each experiment a carefully graded set of questions tested the levels of understanding of the various abilities. All but the least able were required to write their own accounts of what they had done. At appropriate points they were referred to film strips, film loop and books. At the end all who were
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capable of it were asked to devise experiments to get from North Sea gas as many different forms of energy as possible and also to write essays about the world's energy resources.
The chief resource remains the teacher, who still needs to use his knowledge and professional skill and who cannot be replaced by worksheets or any other aids.
Teaching and methods
Whole-class teaching
a By far the commonest method observed during visits was whole-class teaching. All the pupils irrespective of ability were kept together studying the same topic at the same time and progressing at the same rate. This had the advantage of being relatively easy to organise and of being the only method with which many teachers were familiar and confident. There were obvious difficulties in pitching the lessons and practical work at levels to suit all abilities.
In one lesson class practical work involved introduction to the electrolysis of copper (II) sulphate. Pupils used worksheets which had been well prepared and which asked for additional work and thought from the faster workers by presenting appropriate questions. Nevertheless the pace of this lesson, like so many others seen, was slow and the worksheets were hardly necessary since the teacher, in answering many questions, went through the whole procedure on the blackboard. Class discussion was good, however, and average as well as able pupils gained some understanding of the phenomena observed but the less able understood very little, the use of terms such as electrolyte, anode and cathode being a particular stumbling block.
b It is clear that there are serious disadvantages in using whole-class teaching methods exclusively. Nevertheless, with younger children in secondary schools, good teachers who are sensitive to individual needs have been seen to employ these methods successfully provided that the classes were not too large (but see General comment b below).
Individual learning
This method, used in a small number of science departments, attempted to provide for each pupil to work at whatever level and pace were suitable. Individual assignments of work, using worksheets, were provided and self-testing systems could be included. It provided for pupils at different stages of development, and therefore it was a way of teaching mixed ability groups. Thus one pupil might be considering the difference between meiosis and mitosis while another was examining the parts of a buttercup flower. There were difficulties, however. Great demands were made on the teachers, who were faced with complex organisational problems, especially in practical work. Most serious of all, however, was that the pupils lacked the stimulus which comes from working in a group. A pupil's response might be to the worksheet and not to other pupils or the teacher.
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Small group working
Perhaps the most promising method was that which provided for small group working. This could allow for pupils being at different stages of development and for the good intellectual and social effects of group interaction; foremost amongst these was the increased opportunity for language development.
Team teaching
Cooperative teaching was seen to be effective when circumstances allowed it. Two or more teachers shared the work of circulating round a laboratory or interconnecting laboratories during practical sessions, so supporting and complementing one another. Sometimes one teacher with special expertise introduced a topic by giving a lead lesson to one or more classes of pupils before they dispersed into smaller groups under different tutors.
General comments
a There is much to be said for a science teacher developing a repertoire of teaching methods and at any one time using whichever method seems to be most suitable for the pupils, individually and collectively, and for the topic being taught.
b Science teachers rarely have skills in handling pupils in need of special help with reading and writing. Ways of helping the teachers to achieve these need to be explored. The presence of a specialist remedial teacher in the laboratory with a mixed ability group can be very effective, but this procedure has been observed in only a few schools.
Assessment
Whatever the form of class organisation, good assessment and recording procedures are required. Mixed ability grouping has stimulated many science departments to give serious and praiseworthy consideration to this aspect of their work, but many of those visited have yet to do so. It seemed to be particularly unfortunate when different teachers in a department operated their own methods of assessment with no attempts to achieve coordination or comparability; this suggested the need for departmental planning and policy meetings.
In many cases there was need for the science department to make more deliberate attempts to evaluate the success or otherwise of the course provided and of the teaching methods adopted.
Staff
Very few teachers, whether experienced or inexperienced, have had any guidance on mixed ability teaching during their initial training. Many are getting information and help from each other, from books, from articles in professional science journals and from in-service training. An impressive by-product of the growth of mixed ability science teaching is the way in which many teachers, fully convinced of the benefits to be gained from this form of organisation, have come together to work out ways of overcoming difficulties.
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During the course of visits mixed ability science teaching has been seen to entail much work (often more than with other methods of organisation) in the preparation of individual lessons and the collection of materials. There can be nothing but praise for the way in which many science teachers have willingly accepted this load. The load is sometimes, however, so great as to cause undue strain, and lack of time for marking books can jeopardise standards. When financial resources permit, relief could be provided by increasing the amount of laboratory and clerical assistance.
The effects of mixed ability science teaching
Pupils' attitudes to each other, to the teacher and to science may be improved, although this is not always the case.
Gains and losses in pupils' progress are less clear. The standards of work as seen by HM Inspectors are usually acceptable for the average and less able pupils. Many teachers consider that the standards achieved by these pupils are better than they were under a setted or banded organisation. In numerous cases, however, HM Inspectors' impression is that in the early years able pupils are underachieving (for example in quality and range of writing as well as in their grasp of concepts) but with a spurt in Year 4 and Year 5 many gain creditable grades in science at O-Ievel.
In previous sections mention has been made of some possible disadvantages of mixed ability grouping, although some of these apply also to other methods of organisation. Homework presents a problem because of the need to differentiate between abilities; it has been abandoned in some schools. With some notable exceptions, reference books and textbooks are less frequently used in a number of schools than they were before.
With good teaching, backed by good resources and with classes which are not too large, the disadvantages of mixed ability grouping are nearly all avoidable. Examples have been seen of science departments which are doing much to overcome difficulties. Mixed ability science teaching is still in its infancy and it seems likely that the work will become more effective as more experience is gained.
Considerations when mixed ability science teaching is adopted
While effective teaching of a modern science course is difficult with large classes under any organisation, with mixed ability groups the difficulty is even more pronounced.
With present levels of expertise there may be a serious decline in standards and progress if mixed ability science teaching extends beyond the second year.
Good, well equipped laboratories with a full range of resources, including ancillary staff, are even more necessary than with groups organised by ability.
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The additional demands made on professional skill often add to the stress undergone by both experienced and new teachers, but frequent consultations, often found in those departments practising mixed ability grouping, may ease and benefit teacher induction.
Collaboration between science teachers and remedial departments in helping the least able should be encouraged and developed.
Ways of helping the able pupil need development.
There is need to find ways of avoiding sudden changes in the pace of work and of demands made on pupils as they transfer from mixed ability groups to examination sets for GCE O-Ievel and CSE.
Teachers should note the advantages to be gained from developing a repertoire of teaching methods.
Science departments could, with advantage, look for ways of measuring the success of their courses, organisation, and teaching methods which are intelligible to parents and others outside the schools as well as to pupils and staff.
There is need for more initial and in-service training. The relative contribution of outside and school-based in-service training should be considered. There are two aspects, one concerned with the theory of learning, including concept formation and language development, and one with the ways of putting this into practice.