Management hierarchy: strategic, managerial and operational

There are three levels of management hierarchy: strategic, managerial and operational. 

Part 1:Review at least 4 academically reviewed articles on each management hierarchy. Summary the articles in your own words.

Part 2:Discuss how the three levels of management hierarchy: strategic, management, and operational relates to the mission of a business.

Part 3:As an IT professional, how would you use information technology to improve the efficiency the three levels of management hierarchy?