[Abha Sharma]

Settlements are differing in size and functions based upon physio-historic and socio-economic conditions, but they can be graded and grouped in the hierarchical order in any regional set up. The spatial organisation of growth centres and their orders distributed in geographic space is the main consideration in the present study. Hence, the gradation and re-grouping of the growth centres into of size classes is termed as hierarchy. 
A character of central places to serve their respective surrounding, territory in terms of cultural, commercial and administrative requirements. Over the past 50 years, location, allocation analyses have developed a variety of models termed ‘hierarchical’ in that they incorporate multiple levels of either goals or facilities