  With the pandemic of COVID-19, people around the world increasingly work from
home. Each natural person typically has several digital identities with
different associated information. During the last years, various identity and
access management approaches have gained attraction, helping for example to
access other organization's services within trust boundaries. The resulting
heterogeneity creates a high complexity to differentiate between these
approaches and scenarios as participating entity; combining them is even
harder. Last but not least, various actors have a different understanding or
perspective of the terms, like 'service', in this context. Our paper describes
a reference service with standard components in generic federated identity
management. This is utilized with modern Enterprise Architecture using the
framework ArchiMate. The proposed universal federated identity management
service model (FIMSM) is applied to describe various federated identity
management scenarios in a generic service-oriented way. The presented reference
design is approved in multiple aspects and is easily applicable in numerous
scenarios.
