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Die Transformation der öffentlichen Verantwortung im Bereich der sozialen Wohlfahrt führte in den letzten Jahren zu einem gestiegenen Forschungsinteresse an Mitarbeiten-den, die sich an der Schnittstelle zwischen öffentlicher Verwaltung und direktem Kontakt zu Klient*innen befinden. Die vorliegende Arbeit geht am Beispiel der Schulsozialarbeit an Potsdamer Grundschulen der Frage nach, inwieweit Vertrauen in Klient*innen die Nutzung von Ermessensspielräumen durch Schulsozialarbeiter*innen beeinflusst. Das Street-Level Bureaucracy Framework nach Michael Lipsky spannt dabei den theoretischen Rahmen, während qualitative Interviews mit Schulsozialarbei-ter*innen die Basis für die Beantwortung der Forschungsfrage darstellen. Die Ergebnis-se zeigen, dass ein geringeres Maß an Vertrauen in Klient*innen dafür sorgt, dass Schulsozialarbeiter*innen durch Bewältigungsstrategien wie der Rationierung von Res-sourcen und dem gedanklichen Rückzug von Klient*innen versuchen, ihre Arbeitslast zu verringern. Ein höheres Maß an Vertrauen in Klient*innen sorgt hingegen dafür, dass sie ihre Ermessensspielräume zu Gunsten dieser Klient*innen nutzen, zum Beispiel durch das Umgehen von Datenschutzregeln zur effektiveren Fallbearbeitung.
Identity management is at the forefront of applications’ security posture. It separates the unauthorised user from the legitimate individual. Identity management models have evolved from the isolated to the centralised paradigm and identity federations. Within this advancement, the identity provider emerged as a trusted third party that holds a powerful position. Allen postulated the novel self-sovereign identity paradigm to establish a new balance. Thus, extensive research is required to comprehend its virtues and limitations. Analysing the new paradigm, initially, we investigate the blockchain-based self-sovereign identity concept structurally. Moreover, we examine trust requirements in this context by reference to patterns. These shapes comprise major entities linked by a decentralised identity provider. By comparison to the traditional models, we conclude that trust in credential management and authentication is removed. Trust-enhancing attribute aggregation based on multiple attribute providers provokes a further trust shift. Subsequently, we formalise attribute assurance trust modelling by a metaframework. It encompasses the attestation and trust network as well as the trust decision process, including the trust function, as central components. A secure attribute assurance trust model depends on the security of the trust function. The trust function should consider high trust values and several attribute authorities. Furthermore, we evaluate classification, conceptual study, practical analysis and simulation as assessment strategies of trust models. For realising trust-enhancing attribute aggregation, we propose a probabilistic approach. The method exerts the principle characteristics of correctness and validity. These values are combined for one provider and subsequently for multiple issuers. We embed this trust function in a model within the self-sovereign identity ecosystem. To practically apply the trust function and solve several challenges for the service provider that arise from adopting self-sovereign identity solutions, we conceptualise and implement an identity broker. The mediator applies a component-based architecture to abstract from a single solution. Standard identity and access management protocols build the interface for applications. We can conclude that the broker’s usage at the side of the service provider does not undermine self-sovereign principles, but fosters the advancement of the ecosystem. The identity broker is applied to sample web applications with distinct attribute requirements to showcase usefulness for authentication and attribute-based access control within a case study.