Theorists
Examples
100

Developed the general systems theory. 

Who is Urie Bronfenbrenner?

100

The 4 levels of the system theory. 

What are microsystem, mesosystem, exosystem, and macrosystem?

200

Russian Born-American Psychologist

Who is Urie Bronfenbrenner?

200

The extra level included in the ecological systems theory.

What is the chronosystem?

300

Developed the ecological system theory. 

Who is Ludwig von Bertalanffy?

300

What level would this system be? When families make their decisions together and are generally the closest-knit group in society. 

Microsystem on a macro scale 

400

Developed Bowenian Family Therapy after working at the Menninger Clinic and the National Institute of Mental Health.

Who is Dr. Murray Bowen?

400

What level would this system be? The birth of a sibling causing direct and large changes in the individual.

Chronosystem on a microscale

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