Information and type of material obtained were digital recordings of interviews, participant-produced images of their windows and room interiors, floor plans, and OBEA forms completed in situ by the researcher (Figure 1). Research material also included keywords or short descriptions added to the images by the participants. The purpose of the initial walk-through and the environmental assessment was to check that the participant had taken photographs of each window and not accidently missed any, to see the windows in the actual setting, to record interior features relevant to the research question, and to form an impression of the home before carrying out the interview. For example, measurements were taken of window size and room floor area for later calculation of the glazing-to-floor ratio as an indication of daylight availability in each room (see Table S2 in supplemental data online). The OBEA forms were further refined into The Window Treatment Inventory to be used in future on-site assessments (see Figure S2 in supplemental data online).