Human organization as a system can be likened to a human model using the biological approach which considers the nervous, circulatory,digestive, preproductive, etc. system as separate systems. Each of these individual systems is a subsystem of the total system which is interrelated and interdependent.

In addition to this model the psychological perspective of human system will also be considered. The important variables feelings, values, and norms of behavior all interact wth other variables. These are influenced by other variables. As we learn human behavior in organization, we use the psychological- biologicaly perspective to study human being as a complete system and also as a sub-system of the social organization and of society as a whole. From this context human organization may be considered as a system of roles.