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1920

William Moulton Marston develops

a theory to explain people's emotional

responses to various stimuli

1928

Marston writes Emotions

of Normal People

1931

Marston writes Integrative Psychology

1940

Walter Clarke develops the

Activity Vector Analysis

1950

John Cleaver creates a 24 tetrad,

forced-choice instrument from the

Activity Vector Analysis

1970

John Geier and Dorothy Downey

create the Personal Profile System

Performax Systems International is created

1984

Carlson Companies purchase

Performax Systems International

creating Carlson Learning Company

1986

Carlson acquires Personal Dynamics,Inc (PDI)

1990

Personal Profile System Software (PPSS) introduced - DOS Version

1992

PPSS Windows version introduced

with supplemental reports

1994

Personal Profile System revalidated

2000

Carlson Learning Company

sold to The Riverside Company

Inscape Publishing, Inc. formed

2003

Inscape introduces EPIC

PPS renamed DiSC Classic

DiSC Classic 2.0 on EPIC announced

DiSC Indra introduced

2004

DiSC PPSS available on EPIC

DiSC Facilitator Report available

Everything DiSC Facilitation System introduced

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