Ippon 
- full point - end of match.
Can be earned by a really good throw where the opponent
lands flat on his/hir back, by holding the opponent on
his/her back for 25 seconds, by submission of the opponent
during any point of the match or specifically in a choking
or joint locking situation, or by earning two waza-aris
(described next).
Waza-ari 
- half point.
Can be earned when the opponent is thrown, but doesn't quite
land flat or lands without much impact flat on his/her back.
Can also be earned by holding the opponent down for 20-24
seconds.
Yuko 
- quarter point.
Can be earned when the opponent is thrown and lands on
his/her side or not quite flat on his/her back. Also earned
by holding someone down for 15-20 seconds. Yukos do not add
up to produce waza-aris.
Koka 
- eighth point.
Can be earned when the opponent lands on his/her butt
basically. Also by holding someone for 10-15 seconds. Kokas
do not add up to produce yukos.
A person with one yuko would beat a person with any
number of kokas. A person with one waza-ari would be a
person with any number of yukos. This is the point about
adding up scores. Only waza-aris can be added to earn an
ippon.
There are also warnings that can give your opponent
points.
Hansoku Make - Disqualification
(equivalent to ippon).
Keikoku - Warning
(equivalent to waza-ari).
Chui - Caution
(equivalent to yuukou).
Shido - Note
(equivalent to kouka).
