In this paper, we explore why partial identity technologies such as privacy-preserving attribute based credentials (pABCs) have been around for a while without getting adopted in real life identity solutions and how we might design for such technologies. This is done by exploring whether this is perceived useful from the user as well as the service provider side through the design of a digital identity solution in Denmark. Two interview studies with three and 11 participants representing service providers and users, respectively, were carried out and a design for a digital identity solution was created. The results show that while there is a use for such technologies, there are certain issues that need to be considered. Based on the results, we present 8 design recommendations on implementing a digital identity solution based on pABCs. For future work, we suggest that these studies should be repeated in other national contexts to explore how general the results are.

Shomir Wilson, Florian Schaub, Aswarth Abhilash Dara, Frederick Liu, Sushain Cherivirala, Pedro Giovanni Leon, Mads Schaarup Andersen, Sebastian Zimmeck, Kanthashree Mysore Sathyendra, N. Cameron Russell, Thomas B. Norton, Eduard Hovy, Joel Reidenberg, Norman Sadeh. Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers). 2016.

Addressing human impact on the environment by focusing on shared everyday practices, rather than just individual behavior is an approach that shows promise. However, it can be challenging to put this approach into concrete use, especially in teams unfamiliar with the practice orientation. To support the practice approach, we introduce the Contextual Wheel of Practice (COWOP), a framework that can: 1) help researchers and designers to better understand practices, 2) design effective interventions, and 3) facilitate collaboration between team members from different disciplines, who may not be familiar with the practice orientation. We describe how COWOP was developed, and our experiences using COWOP in three different cases. We then position COWOP as part of the "turn to practice" in HCI, and discuss how it can be useful to HCI researchers and be applied in domains beyond sustainability, such as healthcare and privacy.