The division of subjects under diarchy system was irrational, prejudiced, unscientific and impracticable. The division of the subjects was made in such a way that some one part of the subjects touched other one and lay under both the subjects. For example, education was a transferred subject, but education related to Europeans and Anglo – Indians was a reserved subject. The division of subjects was so irrational that such impracticable division cannot be imagined.
In diarchy system, the agriculture minister did not have irrigation department under him. Moreover, the industry ministers were made without giving them the departments of labor, factories, hydroelectric power and minerals. All these decisions were absolutely impracticable. There was lack of cooperation among the members and ministers. As a result, diarchy system failed.