The purpose of the paper is to analyze the design of the Asklepieion at ancient Messene in Greece. The sanctuary consists of the Doric temple and surrounding Corinthian stoas, and dates from the late 3rd century BC. Our proportional analysis of the buildings gave the following conclusion. At the initial stage, the temple width was given as 40 ft, and the axial intercolumniation of the temple - the module (U) - was calculated by the simple ratio to the temple width. The authors discuss that the main dimensions of the temple and stoas were calculated based on this module. Then, detailed dimensions were decided according to the simple proportional relationship and rounding of dimensions. Thus, whole process of the dimensional decision was logically explained.
