Towards a Common Principle of Biological Control

This paper reviews the interplay between biology and control theory as a typical example of trans disciplinary knowledge integration. Control is a fundamental function of the living or ganism that works in all a spects of the life. Various control mechanisms are ubiquitously built-inatall levels of body structures of living or ganisms and work all the time to support the life. They are diversely different from one to an other with different material bases and structures, but there are many reasons to think that have some common ground and design principles. It is argued that a unified approach is exploited by focusing on a biological way of dealing with environmental changes to invest igatevarious controle chanisms of living or ganisms. The notion of compound control is proposed as a common principle of biological control based on the trans disciplinary nature of control theory.