Most of the writing on the new “Management Science,” that is on the application of systematic methodology to the job of managing in the business enterprise, has so far come from the scientists. Understandably it has therefore focused on the finding of areas in business to which the scientist can apply tools and techniques with which he is already familiar, and on the sharpening and development of these tools. The all but universal approach has been: here is a scientific method, here are scientific tools and techniques; let us find applications for them in the business enterprise. This paper proposes to look at “Management Science” from the point of view of the Manager. Its focus will therefore be on determining what methodology, what tools and techniques the Manager needs to do an orderly and systematic job of managing. Concretely the focus will be on the specific process through which the Manager does his work, and on the specific object to which his work is directed; one focus will be on Decision Making, one on the Business Enterprise and its structure. And the aim of this paper is to develop, albeit in rough and sketchy form, some specifications for “Management Science.”