Statement of the problem: Informal settlements, as a growing phenomenon in metropolises, face numerous physical, social, and behavioral challenges. One of the less studied aspects is the impact of the physical structure of these settlements on the behavioral patterns of residents. This study addresses the issue of how physical-spatial characteristics affect people's daily behavior.
Objective: The main objective of this study is to analyze the relationship between physical-spatial structure and behavioral patterns of residents in Morteza Gerd neighborhood as an example of an informal settlement in District 19 of Tehran. Also, identifying the types of behavioral spaces formed in response to this structure is considered a secondary objective of the research.
Research Methodology: This study was conducted using a mixed method (quantitative and qualitative) and an applied approach. Data were collected and analyzed using various techniques including library studies, field observations, distribution of 378 resident questionnaires, as well as spatial analysis of the physical structure of the area (using the spatial layout method) and prioritization of areas based on research criteria (using the TOPSIS technique). Findings and Conclusions: The results of the study show that the physical-spatial structure plays a very important role in shaping the behavior of residents. Areas with better access, appropriate uses, and more open space witnessed richer social behaviors and a higher sense of belonging. In contrast, areas that were adjacent to industrial uses or had poor access reduced social interactions and feelings of insecurity. Overall, this study concludes that any planning to improve the quality of life in these settlements should begin with improving the physical-spatial structure and paying attention to its relationship with resident behavior.