The spatial perception of participants needs to be measured separately for each of the three judgments. 3.1 - The three components of spatial perception at this early junction in the design process Size of Volume. The most basic attribute of space is its shape and size. The simplest way to measure people's perception of room sizes is to ask them directly.
Most people are quite comfortable expressing distances as a function of other distances.
Very few people feel they can be accurate in expressing distances using a metric system, such as feet or meters, because metric distances are not immediately intuitive. To have a greater accuracy in distance data, the participants can be pre-selected so that only those who are particularly good at estimating distances in absolute lengths take part in the study. For this experiment, I invited professional space designer because have ample experience estimating lengths of building materials and interior spaces. The task of estimating the dimensions of virtual spaces should be easy for this group because it is something they do often in real environments. Also of great importance during the early phases of design process is the ability to evaluate the relationship of the overall spaces.