The aimis to describe the development of a middle-range theory by using an inductive-deductive approach. A theory of well-being
supporting physical environment of home-dwelling elderly is used as an example. The inductive-deductive theory development
process is described through four different phases: (1) the creations of concepts were described inductively through concept
synthesis, (2) relationships between the concepts were examined to set up a hypothetical model, (3) hypotheses were set up to
verify the concepts and to test hypothetical models, and (4) the verification and presentation of the theory.