Luís Dias


IRIS - Interactive Robustness analysis and parameters' Inference for multicriteria Sorting problems


This software has been built to support the assignment of actions (alternatives, projects, candidates) described by their evaluation (performance) at multiple dimensions (criteria) to a set of predefined ordered categories, using a pessimistic variant of the ELECTRE TRI method. Rather than demanding precise values for the ELECTRE TRI parameters, IRIS allows to enter constraints on these values, namely assignment examples that it tries to reconstitute. It adds a module to identify the source of inconsistency among the constraints when it is not possible to respect all of them at the same time. On the other hand, if the constraints are compatible with multiple assignments for the actions, IRIS allows to draw robust conclusions by indicating the range of assignments (for each action) that do not contradict any constraint.

VIP (Variable Interdependent Parameters) Analysis


This software considers the aggregation of multicriteria performances by means of an additive value function under imprecise information, when the decision makers are not able to (or do not wish to) fix precise values for the importance parameters. These parameters can be seen as interdependent variables that may take several values subject to constraints. VIP Analysis  incorporates multiple tools of analysis for these situations. It proposes a methodology based on the progressive reduction of the number of alternatives and the parameters imprecision, introducing a concept of tolerance that lets the decision makers use some of the tools in a more flexible manner.

Decision Deck


The Decision Deck project aims at collaboratively developing Open Source software tools implementing Multiple Criteria Decision Aid (MCDA). These software components implement the common functionalities of a large range of multiple criteria decision aid methods, which already include IRIS and VIP Analysis.