Duality is a fundamental concept in Socionics. Dual relations are characterized by mutual benefit and support. Duality occurs between two members of the same quadra who are both either rational or irrational.
In dual relations, the super-id functions of both partners are the ego functions of the other. As the super-id functions are generally the areas in which a person needs assistance from somebody skilled in these areas, duality interaction is quite rewarding and satisfying for both parties. — Wikipedia
A classic thought…
"Just as we have two eyes and two feet, duality is part of life." — Carlos Santana
Spotting a complimentary pair
Simply take a type and reverse its first three letters to get its corresponding complimentary pair as summarised in the table below and sorted by quadra.
| Alpha | Beta | Gamma | Delta |
|---|---|---|---|
| ENTp & ISFp | ESTp & INFp | ESFp & INTp | ENFp & ISTp |
| ESFj & INTj | ENFj & ISTj | ENTj & ISFj | ESTj & INFj |

Caption: The concept of yin and yang (or earth and heaven) describes two opposing and, at the same time, complementary (completing) aspects of something. In this case, an ideal pictorial representation of complimentary relations.
A closer look at each pair…
Assuming you've read the description above from Wikipedia you should now have a general idea about complimentary relations. However since each type differs in their own right (as the small groups expose) each complimentary relation has its own dynamics or special ways of progressing too. The following table attempts to clarify the eight specific pairs of complimentary relations.
| 8 Pairs | Extended list of Small Groups |
|---|---|
| A1: ENTp | Alpha, Researcher; Extrovert Irrational; Distinguished; Restructurer; Infantile; Firm; Conceptualist; Anesthetic |
| A1: ISFp | Alpha; Socialite; Introvert Irrational; Hopeful; Diplomat; Careful; Sincere; Liberalist; Hypomanic |
| A2: ESFj | Alpha; Socialite; Extrovert Rational; Esteemed; Guardian; Careful; Passionate; Traditionalist; Depressive |
| A2: INTj | Alpha; Researcher; Introvert Rational; Confident; Constructor; Infantile; Cool; Conceptualist; Anesthetic |
| B3: ESTp | Beta; Pragmatist; Extrovert Irrational; Esteemed; Restructurer; Aggressor; Firm; Liberalist; Hypomanic |
| B3: INFp | Beta; Humanitarian; Introvert Irrational; Confident; Diplomat; Victim; Sincere; Utopianist; Hyperesthetic |
| B4: ENFj | Beta; Humanitarian; Extrovert Rational; Distinguished; Guardian; Victim; Passionate; Utopianist; Hyperesthetic |
| B4: ISTj | Beta; Pragmatist; Introvert Rational; Hopeful; Constructor; Aggressor; Cool; Traditionalist; Depressive |
| C5: ESFp | Gamma; Socialite; Extrovert Irrational; Esteemed; Diplomat; Aggressor; Passionate; Liberalist; Hypomanic |
| C5: INTp | Gamma; Researcher; Introvert Irrational; Confident; Restructurer; Victim; Cool; Conceptualist; Aesthetic |
| C6: ENTj | Gamma; Researcher; Extrovert Rational; Distinguished; Constructor; Victim; Firm; Conceptualist; Aesthetic |
| C6: ISFj | Gamma; Socialite; Introvert Rational; Hopeful; Guardian; Aggressor; Sincere; Traditionalist; Depressive |
| D7: ENFp | Delta; Humanitarian; Extrovert Irrational; Distinguished; Diplomat; Infantile; Passionate; Utopianist; Hyperesthetic |
| D7: ISTp | Delta; Pragmatist; Introvert Irrational; Hopeful; Restructurer; Careful; Cool; Liberalist; Hypomanic |
| D8: ESTj | Delta; Pragmatist; Extrovert Rational; Esteemed; Constructor; Careful; Firm; Traditionalist; Depressive |
| D8: INFj | Delta; Humanitarian; Introvert Rational; Confident; Guardian; Infantile; Sincere; Utopianist; Hyperesthetic |
Closing thoughts on Complimentary Relations
I believe the complimentary relation represents the basis of a long-term relationship since it seems to provide mutual support needed by both individuals. It may show characteristics of a relationship ripe for marriage or of a life-long friendship since both individuals balance each other out so to speak.
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