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The traditional protected web services rely on a user authentication process. The combination of an identifier (e.g., username, email address and so on) and credential (e.g., password) still remains the most widely deployed user authentication process, even though such a process is one of the major sources of security breaches. Moreover, in this traditional setting, the management and sharing of user identity information is cumbersome. The consequence of this is that users increasingly find it difficult to manage their identity data scattered across multiple sites and they have limited controls over their own identity data. In recent times, Self-sovereign Identity (SSI) has emerged as a new mechanism for managing and exchanging identity information in a more user-centric and privacy-friendly way. There are many explorations of SSI in different application domains, however, its utility for passwordless authentication for the web mostly remains unexplored. In this article, we present SSI4Web , a framework which can facilitate a passwordless authentication mechanism for the web by employing a state-of-the-art SSI technology for providing web services with much more user control and greater flexibility. We present its architecture which is based on a threat model and requirement analysis, discuss its implementation details and sketch out its use-cases along with protocol flows. In addition, we analyse its performance, evaluate its security using ProVerif , a state-of-the-art protocol verifier and discuss its advantages and limitations.

This paper proposes performance indicators and metrics for the analysis of shared workspaces. We investigate user activity in various electronic workspaces of a shared workspace system and compare these on the basis of the proposed metrics: activity, productivity and cooperativity. Based on these results we further investigate the intensity of cooperation on shared documents. The investigations show that the proposed metrics permit an identification of the current cooperation status of a workspace as well as a classification of workspaces and benchmarking of the cooperation maturity.

Smarting-up email processing is a challenging task. Users file or retrieve multiple messages every day, while receiving little support from most popular email clients. Incorporating semi-automatic sorting into existing applications can help users with their daily work through more efficient organiza

This paper presents a digital card game that utilizes different multi-touch interaction devices to experience and evaluate cooperative user interactions. Goal of this approach is the exploration of a smart cooperation environment of interconnected devices. We present the system design and implementation as well as an initial user study that indicates the applicability of our approach.

Groupware systems become more and more functional and complex. Often many features are integrated in a monolithic interface that should fit all needs. A new trend towards portal systems can provide flexible and user-adaptable environments. This paper therefore presents a new approach for the modular

Due to the astonishing development in memory and processing capabilities of hand held devices such as smart phones, it is not a dream anymore to enable mobile devices not only as conventional web service requesters but even as providers. The willingness and enthusiasm of service providers place abundant services at the disposal. But this abundance makes the efficiency of service discovery a critical issue. Centralized registries have severe drawbacks in such a scenario due to the dynamic and spontaneous nature of mobile peers. In the quest for a more appropriate approach for mobile web service discovery, we observed P2P to share very similar characteristics with behaviors of peers in mobile network. Hence we tried to find alternate mobile web service discovery mechanisms by using the features of the P2P networks like JXTA modules. The scalability analysis of the approach proves that the discovery can scale to the needs of large cellular networks.

In this paper, we discuss requirements for building trust in locally distributed groups whose members co-operate via shared workspace systems. We argue that appropriate security technology should be an intrinsic part of such systems and describe a conceptual model as well as a recent extension to an existing shared workspace system that provides the respective functionality based on PGP.

Being aware of others' activities has played a vital role in the success of online collaboration. This resulted in the emergence of many groupware systems that provide users with information about the activities of their collaborators in various manners. In virtually all current groupware systems, users are often overburdened by large amounts of unnecessary activity information. This happens because users are most of the time only interested in certain pieces of information for limited durations, while presently there exist no efficient mechanisms for automatically following a user's focus and adjusting the information flow directed at her/him. In this paper we present as a practical solution to this critical problem the dynamic awareness system, which extends the functionality of the BSCW shared workspace system. Key element of the dynamic awareness system is its rule-based inference mechanism to adjust the notification intensity, which reduces the information overload and indirectly allows users to better keep track of relevant events, as well as to manage more efficiently large amounts of shared information. We tested the effectiveness of the dynamic awareness system under real-life circumstances and describe the evaluation results.

Groupware provides an essential support for the maintenance of Knowledge Management in many organizations. Accordingly, the use of groupware systems has become widespread. However, still some problems regarding the way in which business process are implemented exist, because they require the communication between several of these groupware systems to fulfill all required objectives in the organization. For that reason, interoperability issues have taken a vital role in the business sector. In this area, one of the leading technologies is the Web Service standard.. In this paper we describe the design of a Generic Collaborative Working Environment to provide the basis for allowing interoperability with several groupware systems. We also reflect how Web Services technologies are used in the design of this environment.

In this paper, we discuss security issues of Web based CSCW systems and describe a conceptual model as well a recent extension to the BSCW Shared Workspace System (Appelt, 1999) that satisfies high security requirements for communication and cooperation in an inter-organizational setting by using encryption technology

This paper provides an overview on the ECOSPACE Integrated Project that is partly funded by the European Commission in the framework of the collaborative work environments framework. We present the motivation, goals and research approach of the project

This paper describes the design and implementation of a coordination mechanism to support follow up of decisions made in meetings, using task management and semi-structured messages in an integrated way. Two questions lead our research: i) can a set of group support mechanisms, enabling the link between pre-meeting, meeting and post-meeting activities, allow for better coordination of decisions being implemented?; ii) can electronic elements, which belong to daily project scenarios, provide awareness of decision implementation's problems? Our evaluations and conclusions indicate that such elements (ie. tasks and emails) provide means for coordination of decision follow up

Shared workspace systems provide virtual places for self-organized and semi-structured cooperation between local and distributed team members. These cooperation systems have been adopted by a large community over the past years and the volume of managed information is increasing rapidly. However, a problem that occurs frequently is the missing user support for the workspace organization and a lack of assistance finding the right place for storing new documents and contributions. This often results in poorly organized workspaces, making it difficult to find documents. Starting with a user survey, this paper presents a solution that assists the users in finding the right location based on an analysis of recent individual and group activities combined with a content analysis of the shared workspaces. The evaluation of the system shows evidence that the combination of the two approaches provides a useful assistance for different work situations. Furthermore some unexpected effects could be observed that makes the solution also suitable for cooperative knowledge management.

The introduction of new technologies and processes for communication, collaboration and knowledge exchange has changed considerably our work environment and the way we are organising our work. In this paper the implications of flexible mobile and collaborative workplaces for global value networks are explored through future scenarios and roadmapping. In particular we focus on the advances in mobile and location-aware workplaces and their role in organising and coordinating global business activities. The paper presents several mobile workplace scenarios and outlines a roadmap and a research agenda for strategic research and innovation.

The post-decision implementation process involves the execution of organizational processes and people with different skills and knowledge, contributing to future decisions and best-practices. The aim of this paper is to analyze the creation of group storytelling as a mechanism to represent tacit knowledge in the scope of post-decision implementation processes. The concepts of post-decision and group storytelling are presented and discussed. A technological support tool is proposed.

This paper describes the design and functionality of the Social Web Cockpit, an assistant that supports users while traversing the World Wide Web. The cockpit provides social awareness and supports collaboration, notification of interesting Web pages, collaborative construction of community knowledge, and the development of a community vocabulary. The cockpit aims at turning the World Wide Web from an interaction medium into a cooperation tool, for the active support and self-organization of virtual communities.

This paper describes a cooperative design approach and the experiences collected when applying this approach for developing and introducing a groupware system for the support of collaborative document processing in a geographically distributed ministerial environment. Methods were developed for the elicitation and analysis of explicit and tacit user requirements in work practice. The combination of these methods facilitated a mutual learning process between users and designers. These methods include interviews, laboratory workshops, user and designer workshops, as well as mediation by user advocates who explore users' needs during regular site visits. A portrait of the various methods is given, followed by a description of the experiences with the various types of interactions between the users and design team. This is accomplished with a report from system usage and implications these design methods had on system design.

ti this paper, we present experiences from long-term groupware developmen~introduction and use in an organization.We report lessons learned concerning how a complex design process operates and how its components interac~Our experiences suggest that the processes of requirement analysis, system developmen~and user support need to fac~tate the mer=tig of individud work patterns into congruent system usage.We confirm tbe chm=tig nature of groupwae use by reporting empirical restits descnbmg different learning phases.Ke~ords Cooperative desi~gn,user advocacy, groupware requirements, group work, system inwoduction, prototyping.This paper begins with a description showing how coordination with groupware use is related to the process of group developmen~We then outiine our particular design approach explaining how we tried to achieve a common understanding between tie design team and users, and how we tried to account for user group developmen~ h the foUowing section we present empirical results on the actual use of the system in the work setting, illustrating how tbe group stived to achieve congruent conventions.*POL~e~is funded by

This paper presents a hybrid approach for the support of workflows in a ministerial environment that integrates a Web-based interface into a groupware platform.A scenario of the application area is examined to identify the basic requirements for an adequate user support.The basic PoLffeam approach for the support of workflows by electronic circulation folders is introduced.Focal point of the paper is the design of the Web-based interface for the interaction with electronic circulation folders and its seamless integration into the groupware platform.

This full-day workshop is intended for designers, researchers, and decision-makers to discuss and compare their experiences with designing and introducing groupware in an organizational context. Considering the impact that groupware has had on collaboration in recent years, there are relatively few published studies on experiences with introducing groupware. With so few comparisons, it is difficult to develop and appropriate framework which could guide its introduction. Yet it is important not only to understand successes and failiures with methods, but also design and methodology compromises that groupware implementers must live with.

S.199-208

The need for open computer support for cooperative work (CSCW) systems is examined. Their requirements and impact on distributed systems are discussed. The Mocca project for developing an environment which will support open CSCW systems is described. It is shown that the open distributed systems (ODP) experience and approach can be a valuable tool in realizing open CSCW systems. Similarly, the ODP standardization effort can benefit both from the experience of CSCW application developers and from the requirements which CSCW systems place on their distributed platform.>

S.115-142