Decision making in a business are often restricted by the limitation of available resources and at the same time, a business manager has to meet specified goals. In this paper, quantitative analysis is importance for the managerial decision process. Nevertheless, keep in mind that quantitative analysis can never provide the entire answer for all strategic decisions. Use it with care and use it as a systematic way of working through a complex managerial decision process. Decision modeling is a scientific approach to managerial decision making where we develop a mathematical model of a real-world problem. The model should be such that the decision-making process is not affected by personal bias, emotions and guesswork.