## 4 Design, Development, and Implementation
### Identification of Circulation Area Parameters in Universally Accessible Housing (UAH)  
To understand the parameters and various variables that influence the housing design in relation to circulation areas, a set of data was collected from Chile's current accessibility regulations, specifically Supreme Decree (DS No. 49) [21]. It is important to emphasize that the evaluation focuses on specific parameters related to the circulation areas of a universally accessible housing (UAH) unit. These parameters were critically identified by a focus group to ensure accessibility and are therefore subject to assessment during the conceptual design phase of the virtual experience. Advanced technologies such as virtual reality and BIM will be leveraged to conduct a detailed analysis. The identified parameters are presented in Table 1, which contains detailed information for each one as defined in [21], specifically for the design of universally accessible housing. The selection of these parameters allows the research to focus on the essential elements that ensure the dwelling meets the basic needs of individuals with physical disabilities. It is important to note that these specific parameters establish the scope of the research, clearly defining the focus and boundaries of the evaluation to enhance understanding and efficiency. To clarify the nature of the parameters presented in Table 1, the \"Analysis and Ergonomics\" column categorizes them based on their dimensional characteristics as stipulated by Chilean regulation DS No. 49:  
* Independent: These parameters are typically defined by a minimum regulatory value. While their specific dimensions are not primarily dictated by interaction with other particular architectural elements for their definition, they permit design flexibility (e.g., a 'Bed aisle width' is regulated with a minimum of 0.6 m but can be designed wider depending on the available space and design intent). * Independent, Fixed: These parameters are characterized by precise, unalterable dimensions or a specific set of dimensions mandated by the regulation for that named parameter. These values must be met as stated and are not typically subject to design \begin{table}
\begin{tabular}{c c c c} \hline
**Area and Zone No.** & **Parametrization** & **Minimum Value** & **Analysis and Ergonomics** \\ \hline \multirow{4}{*}{1. Master Bedroom} & Bed aisle width & 0.6 & Independent \\  & Free maneuvering space & 1.5 & Independent, Fixed \\  & Clear width & 1.5 & Independent \\  & Aisle width & 0.9 & Independent \\  & Clear height & 0.7 & Independent, Fixed \\
2. Bathroom & Transfer area & 0.8 \(\times\) 1.2 & Independent \\  & Free maneuvering space & 1.5 & Independent, Fixed \\  & Clear height & 0.7 & Independent, Fixed \\
3. Living–Dining Room & Circulation width & 0.8 & Independent \\  & Free maneuvering space & 1.5 & Independent, Fixed \\
4. Kitchen & Clear path & 0.9 & Independent \\
5. Circulation Hallway & Free maneuvering space & 1.5 & Independent, Fixed \\  & Circulation width & 0.95 & Independent \\
6. Small Bedroom & Free maneuvering space & 1.5 & Independent, Fixed \\  & Aisle width & 0.9 & Independent \\
7. Secondary Bedroom & Bed aisle width & 0.9 & Independent \\  & Free maneuvering space & 1.5 & Independent, Fixed \\ \hline \end{tabular}
\end{table} 
Table 1: Parameterization, analysis, and ergonomics of UAH: Chilean Regulation DS No. 49.  
variation. For instance, the 'Free maneuvering space' consistently requires a 1.5 m diameter clear of obstacles, and the 'Clear height' beneath designated elements is fixed at 0.7 m by the regulation. This distinction is important for understanding how regulatory requirements translate into spatial design and how they are evaluated within the VR experience. Although the spatial parameters applied in this study were defined according to Chilean regulation DS No. 49, they also reflect foundational ergonomic principles related to human mobility, reach, and spatial comfort.