1. ¹London School of Economics, London, UK
2. ²University of Strathclyde, Glasgow, UK
3. ³Federal University of Santa Catarina (UFSC), Florianópolis, Brazil

Correspondence: G Montibeller, Operational Research Group, Department of Management, London School of Economics, Houghton Street, London WC2A 2AE, UK. E-mail: g.montibeller@lse.ac.uk

Abstract

This paper proposes a tool for multi-criteria decision aid to be referred to as a Reasoning Map. It is motivated by a desire to provide an integrated approach to problem structuring and evaluation, and in particular, to make the transition between these two processes a natural and seamless progression. The approach has two phases. In the first one, the building of a Reasoning Map supports problem structuring, capturing a decision maker's reasoning as a network of means and ends concepts. In the second phase, this map is enhanced, employing a user-defined qualitative scale to measure both performances of decision options and strengths of influence for each means–end link. This latter phase supports the decision maker in evaluating the positive and negative impacts of an action through synthesis of the qualitative information. A case study, which investigates the use of the method in practice, is also presented.