From January 2000 to December 2006, he served as minister for melioration and water resources. In 1981, Mirziyoyev graduated from the Tashkent Institute of Irrigation and Melioration. Refining and melioration, new products could develop. He joined a clandestine theological seminary, while studying in the Melioration Institute in Rivne. This rule was subsequently named Melioration (Herrnstein & Vaughan, 1980). Melioration theory is a theory in psychology used an algorithm that predicts the matching law. Melioration is capable of accounting for behavior on both concurrent ratio and concurrent interval schedules.