Four interaction roles
In his book Brains and Careers (2008), Keirsey divided the role variants into groupings that he called "four differing roles that people play in face-to-face interaction with one another."
There are two Proactive Enterprising Roles:
Initiators (expressive and directive): Field Marshal (ENTJ), Supervisor (ESTJ), Promoter (ESTP), Teacher (ENFJ)—Preemptive
Contenders (attentive and directive): Mastermind (INTJ), Inspector (ISTJ), Crafter (ISTP), Counselor (INFJ)—Competitive
There are two Reactive Inquiring Roles:
Coworkers (expressive and informative): Inventor (ENTP), Provider (ESFJ), Performer (ESFP), Champion (ENFP)—Collaborative
Responders (attentive and informative): Architect (INTP), Protector (ISFJ), Composer (ISFP), Healer (INFP)—Accommodative
The roles were implied in the informing/directing factor introduced in Portraits of Temperament. In his 2010 follow-up book, Personology, "Coworkers" is renamed "Collaborators" and "Responders" is renamed "Accommodators".