Matching for Marriage which is called "Jotok Bichar" -- is not an easy task. Maximum common people depend on Gana for matching and maximum astrologers also depend on only 'Astakut Guna Bichar'. But these are not complete matching system according to Indian Traditional Astrology. For Astakut Guna bichar nobody needs to go to an astrologer because it can be easily calculated through astrological software or astrological sites. I have seen many couples who scored over 30(which is called very good matching or Raj Jotok) in Astokut. But within 1 or 2 years they separated or leading a unhappy married life.
There are many things to judge in both horoscope besides Astokut. Main thing to see that one's chart's deficiency must be fulfiled by another.
The relation in the position of ascendant in both chart must be judged.
Venus of boy and Mars of girl should not be in evil houses.
Relation of ascendant must be earth-water or air-fire. Should not be earth-fire or air-water.
Lord of ascendant of both should not be in evil position of repective chart.
Such many things need to judge for matching two horoscopes.
Unfortunately, very few astrologers know to match horoscope in this way. So couples are suffering for wrong matching.
Another thing is Manglik Dosha. Few astrologers know the perfect rule to get rid of this dosha.
Matching will be calculated in scientific method and detail report will be delivered. Birth details of both are required.