In Indian culture marriage is treated as institution. Due to this, in Hindu Astrology there are special techniques to evaluate the all about the marriage and relationship particularly in view of post-marriage lives of couple including longevity relationship. For this purpose, there is practice of horoscope matching through Koota System, in which physical, emotional and spiritual aspects of both partners are assessed which are understood essential for continuity of life long relationship. It is believed that compatibility check may indicate the condition of relationship between wife and husband.
Kootas quantifies the compatibility in relationship. There are eight Kootas (Ashta-Koota) named as Varna -1 point, Vashya – 2 point, Tara-3 point, Yoni-4 point, Graha Maitri – 5 point, Gana - 6 point, Rashi – 7 point, Nadi – 8 point. Each has been assigned gunas/ points in chronological order. The total gunas are 36. More than 18 are understood suitable for marriage.