In this talk I shall briefly remind the participants of the basic context of requirements engineering, and then discuss three particular aspects. One is the span of a requirement: that is, how far the subject matter of one requirement extends in space or time. Another is the relationship between modelling and reality. A major part of the difficulty of building satisfactory software-intensive systems resides here. The third is the well- known principle 'divide and rule', and the conditions for its successful application.

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This seminar is part of a series for the READ Group, in Maths and Computing and is to be used on a forthcoming course M883.

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