The result obtained using Experimental approaches, Computer based Approaches, Physical Method approaches, Statistical Method approaches to investigate structural properties of ABO3 type perovskite oxides are widely used in last two decades and results so found vary from one approach to another approach. Therefore it is felt that a theoretical unified approach may resolve the variation in the results obtained by different approaches and can predict the actual existing values of structural properties of the materials under investigation. Therefore we have employed a theoretical approach to understand the trends and values regarding structural properties of the above said compounds.