An approach to ordinal classification problems

An ordinal classification task is defined. An approach to the construction of full ordinary classification on the basis of a decision maker’s knowledge is proposed. It allows elicitation of information (or knowledge) in a natural form for the decision maker (through qualitative attribute scales and verbal descriptions of decision classes). It provides verification of the received judgements for consistency and possibilities for corrections and modifications of the elicited classification rules. Problems with obtaining valid judgments from people in ordinal classification tasks are discussed. The decision support system ORCLASS, developed on the basis of the proposed approach, is described.