We propose the concept of level r consensus as a useful property of a preference profile which considerably enhances the stability of social choice. This concept involves a weakening of unanimity, the most extreme form of consensus. It is shown that if a preference profile exhibits level r consensus around a given preference relation, there exists a Condorcet winner. In addition, if the number ...

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This work proposes a competence-based approach, enriched by consensus, for deciding on team compositions, in particular, timeand qualitydependent contexts, where teams have to perform some assigned activities. This problem is very relevant for the dynamics of logistic networks whose nodes are warehouses, distribution centers, and small family businesses that deal with work orders that have to b...

Although Groupware research has yielded a number of productive and successful systems, it appears that the current social media trend is somewhat out ruling the traditional cooperation support systems such as email or shared workspaces. In this paper we propose a conceptual model that identifies major elements and concepts of cooperative systems to provide a basis for their comparison. We will ...

User influence determines how the information is transmitted. Most of the current methods need to consider the complete network and, if it changes, the calculations have to be repeated from the scratch. This work proposes the use of a consensus algorithm to calculate the influence of the participants in a social event through their interactions in Twitter. Retweets, mentions and replies and con...

The proliferation of the Internet has given birth to a number of complaint web sites where dissatisfied and frustrated consumers can easily articulate their opinions and comments on products, services, or companies. Little attention, however, has been paid to the influence of online complaints on potential consumers’ behaviors. This study attempts to provide the understanding of causal attribut...

This study articulates the construct of social presence and develops a social presence questionnaire for examining online collaborative learning with tests for reliability and validity. Questionnaire items were developed by revising the social presence questionnaire developed by Picciano in 2002 as well as reviewing research in the literature of computer support for cooperative systems (CSCW). ...