Abstract: “This paper aims to shed some light on the importance of the facilitator in a GDSS (Group Decision Support System) supported meeting and the role he/she plays in managing these systems and consequently the impact of his/her managing behaviour on the outcomes of a GDSS meeting. Based on a field study interviewing people from real GDSS environment, SIDE’s (Social Identity model of Deindividuation Effects) strategic component assumption and relevant GDSS supported meeting’s literature this paper proposes a new model named ‘Task-Conflict and Anonymity-Enabled GDSS Meeting (TAGDSSM). This proposed model aims to enhance the understanding and interpreting of facilitators’ and users’ behaviour in anonymity-enabled GDSS meeting environment. The TAGDSSM model manifests two major constructs impacting user’s behaviour in the decision making process: GDSS system’s anonymity and facilitator’s behaviour within GDSS meetings. In-depth semi-structured interviews were conducted with experienced GDSS meet”

Keywords: Group Decision Support Systems; TAGDSSM Model; Task-conflict; Technical Anonymity; Strategic Component of the SIDE Theory.