Given an argumentation framework and a group of agents, the individuals may have divergent opinions on the status of the arguments. If the group needs to reach a common position on the argumentation framework, the question is how the individual evaluations can be mapped into a collective one. This problem has been recently investigated by Caminada and Pigozzi. In this paper, we investigate the ...

Studies of how evidence affects beliefs sometimes show belief polarization in response to mixed evidence. However, the nature of the mental processes leading to change in opinion is up for debate. Different accounts of how people process evidence and then update their beliefs make different predictions, especially about one-sided evidence, which is rarely examined. We presented subjects with mu...

Black and Wiliam (1998a, 1998b) demonstrate that formative assessment is one of the most effective strategies for promoting student learning. Since the publication of their reviews, formative assessment has gained increasing international prominence in both policy and practice. However, despite this early innovation, the theory and practice of formative assessment are currently at a crossroads....

In recent years we have conducted about 25 assessments using IEC 61508 or IEC 61511, working mainly to Safety Integrity Level (SIL) 2, but on some occasions to SIL 3. In this paper we present some of the lessons we have learned and offer advice to those seeking certification for components, systems or generic process capability. We cover the three main parts of the IEC 61508 standard: Functiona...

We present an evaluation framework in which the effectiveness of evaluative arguments can be measured with real users. The framework is based on the task-efficacy evaluation method. An evaluative argument is presented in the context of a decision task and measures related to its effectiveness are assessed. Within this framework, we are currently running a formal experiment to verify whether arg...