An example of an analogy drawing upon scientific ideas:
"It is also likely that just how a teaching approach is best applied (or indeed sometimes customised to local conditions) will be quite different in diverse teaching and learning contexts. Teaching is not the kind of activity that can sensibly be planned and prescribed centrally – it always needs to respond to the specific curriculum, the specific course, and the specific learners. Perhaps this is not so different from a chemical process like crystallisation or fractional distillation where certain general principles always apply, yet the precise procedures followed will be modified according to the mass of the sample concerned and the specific reagents involved."
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