When an offence occurs, the victim and offender can overcome the harm done through forgiveness. This paper demonstrates how forgiveness can be supported in social system design. We first describe what forgiveness is, how it is motivated and what benefits follow from forgiveness. Based on this theoretical analysis, we propose five provisions to guide designers who want to encourage reparation in social systems.

In an empirical study we investigated how matchmaking for online gaming platforms could benefit from additional implicit information conveyed in profiles that include photos or voice recordings. We used 150 real online gamer profiles (50 text-only, 50 text & photo, 50 text & voice) to elicit gaming partner preferences from 267 online gamers. We found profiles with photos to lead to lower overall preference, indicating that people used them to reject potential partners. Voice recordings did not reduce overall preference but gave participants relevant information for gaming partner choice. We close with recommendations for the design of profile-based matchmaking systems.

In order to be effective, secure systems need to be both correct (i.e. effective used as intended) and dependable (i.e. actually being used as intended). Given that most secure systems involve people, a strategy for achieving dependable security must address both people and technology. Current research in Human-Computer Interactions in Security (HCISec) aims to increase dependability of the human element by reducing mistakes (e.g. through better user interfaces to security tools). We argue that a successful strategy also needs to consider the impact of social interaction on security, and in this respect is a central concept. We compare the understanding of in secure systems with the more differentiated models of in social science research. The security definition of turns out to map onto strategies that would be correctly described as in the more differentiated model. We argue that distinguishing between and assurance yields a wider range of strategies for ensuring dependability of the human element in a secure socio-technical system. Furthermore, correctly placed can also benefit an organisation's culture and performance. We conclude by presenting design principles to help security designers decide when to trust and when to assure, and give examples of how both strategies would be implemented in practice.

Designing for trust in technology-mediated interaction is an increasing concern in CHI. In advertising, images of people have long been used to create positive attitudes to products or trust in brands. However, the evidence as to whether placing photographs of people on e-commerce web sites has the intended effect has been mixed. This paper reports a study that examined the effect of adding such photographs to 12 existing e-commerce sites, whose reputation had been established through customer ratings. In an experiment with 115 participants, trust was measured using methods that induced financial risk, adapted from experimental economics. Averaging across sites, neither the presence of a photo, nor trustworthiness of the person depicted, had a significant effect. However, the presence of photos reduced participants' ability to identify vendors with good and bad reputations -- the perceived trustworthiness of poorly performing vendors was increased, whereas that of vendors with good reputation was decreased. This result advocates caution when using photos on e-commerce sites to boost trustworthiness, and demonstrates the need for further research into interpersonal cues and on-line trust.