Economic models are considered to be one of the quantitative tools used by management for planning production.
Production function is a tool used to find the best combination of economic resources toward attaining the greatest level of production and the objective of this research is determining best production function in Iraq by using ordinary least square (O.L.S.), two stage least (2 S.L.S.) and restricted least square (R.L.S.). This research contains four chapters. The first chapter contained the introduction and objective and studies relating of production function. The second chapter contained production functions and their types and the methods of estimation.
The third chapter included the application.
The fourth chapter included conclusions and recommendations.