Three Level Access Model

The level of access is an important and practical indicator in measuring the usability of a facility, which can be used to evaluate the compatibility of what was intended in the design with what is used by users. In various studies and evaluations, depending on the opinion of the researcher and expert, levels are usually defined for access in the scope of coverage, which depends on diagnosis and experience. In this article, the numerical effectiveness of the behavior of applicants to use the services of each facility at any distance from those limits and the methods of calculating the effective range and the Three level Access Model (TLAM) are presented. The central coverage in this model is defined in three access levels around the center, each of which includes ۲۵%, ۲۵%, and ۵۰% of the covered area, respectively.