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Teachers working with Key Stage pupils might, for instance, focus on the subject content of science and develop science skills from these areas of experience. This product centred approach could, for example, give rise to oral explanations and demonstrations of scientific knowledge, and, from time to time, practical activities designed to provide direct experience of phenomena with opportunities to explore and investigate these phenomena. In providing a conceptual structure to help the learner build a functional mental representation, the teacher highlights what is relevant and the nature of the relationships between the elements. For example, the teacher might explain the compressibility of air in a bicycle pump by describing it as dispersed particles which may be brought closer or else by comparing it with the behaviour of a spring.
In contrast, teachers might focus on the processes of science and develop scientific conceptual understanding from it. This process-centred approach could, for instance, offer the children experiments and investigations as starting points for acquiring conceptual knowledge with little or no direct teaching of concepts. In this case a conceptual structure is withheld. The onus is on the children to recall or construct a functional mental representation without reference to a teachers' description of one. Pupils might infer relationships in the topic under study and may be given an opportunity to test and revise their ideas.
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