 According to Christensen, this was a legal study, mainly conducted with a legal-dogmatic method and based on traditional legal materials, but the aim of the study went further than describing the precise content of the legal rules at a given moment.Instead, Christensen wanted to reveal underlying norms constituting society; Christensen explains how the rules on security of tenancy had developed in a field between two normative poles – one being the right to property of the owner, the other being the residential right in the tenement house.The study, as well as the article ‘Protection of Established Position, a Basic Normative Pattern’ that was published in 1996, reflect the emphasis on historical and normative developments that characterized Anna Christensen’s research.