The PDEng candidate will, in close cooperation with housing associations, investigate needs and preferences of residents regarding options for home renovations and develop a method to support collective decision-making. Residents' preferences are investigated via a combination of stated choice experiments, data analytics, interviews and focus groups. Discrete choice and econometric models are used to analyze the data quantitatively and to design tailor-made solutions. Group decision making processes are investigated and optimized to support collective decision-making of individual residents within larger units (complexes or neighborhoods). Finally, the candidate is involved in dissemination of scientific results, participation in project meetings and publication activities.