The ethnographic case study attended a team of social workers at work in a public welfare office for children and families. The social workers were observed while arranging cooperation and work-sharing processes with clients, with co-workers in providing organisations and within the district?s administration unit. The aim was to enlighten lee ways for sexual inattention: Where do the social workers forget and oversee the sex of those involved in the planning of interventions? The considerations of how to study this question are followed by a description of the field. A collection of texts about social work and gender illustrates the state of the art within the profession. Central concepts ? ?Case? and ?Social Diagnosis? ? are exemplified to be followed by a description of how cooperation is arranged. On a segregated employment market social workers do rarely participate in gender differentiation processes. Their work-sharing meets regional criteria, they are responsible for parishes. Shared work is arranged without implying gender. Within the structures of the employment market social work concepts and administrative guide lines invite the participants to differentiate. They follow these offers at the age threshold for an educational support service called ?Erziehungshilfe?. At this point they arrange same-sex care relations. Their own sex as case managers is irrelevant.