This paper describes an empiric study of aggregation and deliberation—used during citizens’ workshops—for the elicitation collective preferences over 20 different ecosystem services (ESs) delivered by Palavas coastal lagoons located on shore Mediterranean Sea close to Montpellier (S. France). The impact deliberation is apprehended comparing collectives constructed with without deliberation. sam...

How can the propositional attitudes of several individuals be aggregated into overall collective propositional attitudes? Although there are large bodies of work on the aggregation of various special kinds of propositional attitudes, such as preferences, judgments, probabilities and utilities, the aggregation of propositional attitudes is seldom studied in full generality. In this paper, we see...

We develop a new framework for social choice problems, budgeted social choice, in which a limited number of alternatives can be recommended/prescribed to a population of agents. This limit is determined by some form of budget. Such problems naturally arise in a variety of contexts. Our model is general, spanning the continuum from pure consensus decisions (i.e., standard social choice) to fully...

In the literature on social choice with fuzzy preferences, a central question is how to represent the transitivity of a fuzzy binary relation. Arguably the most general way of doing this is to assume a form of transitivity called max-star transitivity. The star operator in this formulation is commonly taken to be a triangular norm. The familiar max-min transitivity condition is a member of this...

When creating (open) agent systems it has become common practice to use social concepts such as practices, norms and conventions model the way interactions between agents are regulated. However, in literature most papers concentrate on only one of these aspects at time. Therefore there is hardly any research how relate. It also unclear whether something like a norm evolves from or convention th...

In the literature on social choice with fuzzy preferences, a central question is how to represent the transitivity of a fuzzy binary relation. Arguably the most general way of doing this is to assume a form of transitivity called max-star transitivity. The star operator in this formulation is commonly taken to be a triangular norm. The familiar max-min transitivity condition is a member of this...

Nowadays, several crowdsourcing projects exploit social choice methods for computing an aggregate ranking of alternatives given individual rankings provided by workers. Motivated by such systems, we consider a setting where each worker is asked to rank a fixed (small) number of alternatives and, then, a positional scoring rule is used to compute the aggregate ranking. Among the apparently infin...

Results from a modified Diffusion Limited Aggregation (DLA) model are presented. The modifications of the classical DLA model are in the attachment to the cluster rules and in the scheme of particle generation/killing. In the classical DLA model, if a particle reaches the growing cluster, it sticks to it immediately and irreversibly and then the next particle is released. We will abandon this o...