Early diagnosis of cognitive disorder based on ground categories for decision support structures

In this paper we discuss computerized assessments and guidelines for decision making, with accuracy and formalism being required for avoiding ambiguities and imprecision. Note the difference between imprecise or vague information, and being formal and accurate in reasoning with vague values. We may even have a logic allowing for vague reasoning, where the underlying logic is formal and precise, i.e. must always have a clear syntax and semantics together with a accurately described inference mechanism revealing the strength and weakness, and indeed the nature and capacities of that particular underlying logic. Our examples will be drawn from elderly care, in particular from assessments in old age psychiatry and early diagnosis of cognitive disorder.