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Technological modelling is the testing of design ideas to see if they can contribute to a fit-for-purpose technological outcome. There are two types of technological modelling: – Functional modelling is the ongoing testing of design concepts – Prototyping is the realisation of a fully functioning model Taken together, the two types of modelling provide evidence of factors that may impact on, and consequences that may result from, the development of a technological outcome. Technological modelling involves two kinds of reasoning: – Functional reasoning – how to make it happen, how it is happening – Practical reasoning – should we make it happen? should it be happening?