Beginning in the 1950s, he developed a systems theory of the family.

In natural science, systems theory has been widely used approach.

His field of interest is in leadership studies, organizational development through systems theory, and change management.

The role of the individual is diminished in many systems theories.

Social system is a central term in sociological systems theory.

Family therapy is a field of practice mainly built around and developed from systems theory.

He was also among the first to apply systems theory to the historical development of human societies.

One could see it as the application of systems theory to computing.

In such cases, dynamical systems theory may be used for analysis.

The idea of open systems was further developed in systems theory.