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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