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Model of end-user types

The usefulness of system advice of different types and qualities depends on characteristics of the end-user, such as

We are using the term language here in rather a comprehensive sense: when we talk about an end-user's proficiency in the language of the advice, for example, we mean not only whether the language (French, for example) is one understood by the end-user, but also whether the type of explanations offered are comprehensible in terms of terminology and structure.