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MADeM overview

The MADeM (Multi-modal Agent Decision Making) model provides agents with a general mechanism to make socially acceptable decisions. In this kind of decisions, the members of an organization are required to express their preferences with regard to the different solutions for a specific decision problem. The whole model is based on the MARA (Multi-Agent Resource Allocation) theory, therefore, it represents each one of these solutions as a set of resource allocations. MADeM can consider both tasks and objects as plausible resources to be allocated, which it generalizes under the term task-slots. MADeM uses first-sealed one-round auctions as the allocation procedure and a multi-criteria winner determination problem to merge the different preferences being collected according to the kind of agent or society simulated. Thus, the formal definition of a MADeM decision can be represented by the following tuple:

<a, Al, Ag, Pw, Uf, Uw, Cuf>

where:

  • a ∈ A is the agent in charge of making a social decision, where A is the set of all agents in the society.
  • Al is the set of resource or task-slots allocations representing all possible solutions for a specific decision problem.
  • Ag ⊂ A is the subset of agents being consulted or target agents, which can be either infered from the organisational structure or maintained locally.
  • Pw: Ag → ℜ are the personal weights (i.e. personal attitudes) that are used to balance the preferences received from each agent in Ag.
  • Uf is the set of utility functions of the form u: Al x Ag → ℜ representing the agents' preferences with regard to the resource allocations considered.
  • Uw: Uf → ℜ are the utility weights that are used by the agent a to balance the importance given to each utility function in Uf when resolving the winner determination problem.
  • Cuf ∈ {elitist, egalitarian, utilitarian, nash} is the collective utility function representing the social welfare of the simulated society, that is, the type of society where agents are located.

For a complete explanation of the MADeM model click here.

J-MADeM

MADeM is available as an open source library fully integrated into Jason under the name J-MADeM. The aim of J-MADeM is to improve Jason by incorporating the main features of MADeM. Thus, J-MADeM agents can easily define the utility functions expressing their preferences and find socially acceptable decisions for specific decision problems.

Grupo de Redes y Entornos Virtuales
Departament d'Informàtica, Universitat de València