In traditional design system an artifact (vastu) is defined primarily by three of its attributes, viz. size, shape and orientation. Size is defined by dimensions and in case of built forms dimensions are derived from human proportions considered as an important linkage to be adapted. Orientation in traditions is defined by the relationship of the built form with respect to cardinal directions [Achuthan and Prabhu, 1998][i]  and also with respect to the ‘centroid’ (Brahmanabhi) around which the built form orients and grows. This concept of orientation called Yoni (origin or orientation) is an astrological indicator hence has been kept out of the scope of this research.

Two system of units are used for direct measurements of length, one based on the grain size viz. yavamana,  yava means barley grain and mana means measurement) and the other based on human figure viz. manusyapramana (human standard). The smallest unit of measurement in the anthropometric scale used in the traditional architecture is known as matrangula (Matra = unit, Angula = finger). Matrangula is a proportionate unit. The dimension of this unit is fixed as the length of the middle portion of the central finger of the right hand of the yajamanan (master for whom the building is to be constructed).