Everyday, managers makes decisions that commit organizational resources. These decisions determine the survival, growth or even death of an organization. The decision making process is not always activated when a manager perceives a problem as most decisions are made to ensure the stability, continuity and expansion of good prospects and operating performance. (Akintoye and Oluwatosin, 2006; 387).The Process of decision making requires the analysis of alternative solutions and the identification and selection of the alternative that offers the best outcome.

Managers today especially in developing countries use exclusively experience, hunches and rule of thumb in their decision making process. This qualitative approach may be found useful and adequate in certain circumstances but inadequate in others. When the problem is repetitive and the data are quantifiable, we find greater scope for the application of the quantitative techniques to ensure rational and logical decisions.

Okeke (1996; 1) opines that in the qualitative approach to decision making, the manager relies on his personal intuition or past experience in solving similar problems. Such an Intuitive “feel” for the problem may be sufficient for making a decision. He however concluded that there are problems for which more quantitative approach is inevitable.

This quantitative approach that we mean here goes by so many names; Management science, operations research, Quantitative Management, Decision Sciences, Systems Analysis etc. Although attempts have been made by some writers to differentiate these terms, they are quite often used interchangeably, their unifying factor or common denominator being their utilization of the techniques of Mathematics, Engineering, Economics, Computer Science etc in finding solutions to organizational problems.

Operations Research is simply defined as the application of scientific methodology in making more explicit, more systematic and better decisions. (Litterer, 1978:171).Scientific methodology is defined as a process of or logical approach to developing models that explain and predict real-world behavior. (Dannenbring and starr, 1988:1).Thus operation research seeks to describe, understand and predict the behavior of complex systems of human beings and equipment (Stoner, 1982:186).

As the name implies, one can say that operations research means research on operations. Filley and House (1969:10) have noted that organizations and their component units carry on goal-oriented activities referred to as “operations” and that the systematic study leading to decisions as to which operations should be undertaken and how they should be tackled  is termed “research”. What management scientists or operations researchers do is to observe decision making environment, try  to identify, define and analyze problems, construct models which seek to solve these problems, choose those inputs of data required for a solution, find the optimal solution when it could be found and help in the implementation of the identified solution(Levin et al,1986:5).Operations research provides managers with quantitative basis for decision making and enhance their ability to make long range plans and develop broad strategy.

Operations research is approached in a spirit that demands that decision problems be properly defined, analyzed and solved in a conscious, rational, logical, systematic and scientific manner based on data, facts, information and logic (Loomba, 1978:25).The quantitative techniques inherent in management science are not to be regarded as an explicit formular to be uniformly applied to all types of situations. Rather, it is a style of management, which demands a conscious, systematic and scientific analysis and resolution of decision proba,1978:26-27).But the fact that the use of quantitative data constitutes the corner stone of operations research does not in any way preclude the use of qualitative analysis in arriving at optimal decisions. The quantitative approach, must build upon, be modified by and continually benefit from the experiences and creative insights of managers. The final stage in the decision making process, after all, is the exercise of judgment and in making this judgment, the decision taker has to take different factors-quantitative and qualitative into account. For example, there may be sudden change in government policy or of government itself, change of weather, technological advancement and so on. And this makes it very necessary for managers to involve qualitative approaches in decision making.