Editing Samsara:Attributes (section)

==The Basic Modifier==
When using the full list of attributes, the modifiers for most actions should be determined by adding together the two most relevant attributes.  This allows for some variation in strengths to be utilized by characters.  For example, hitting someone defaults to adding together STR and DEX.  Strength relates to the force of the blow, so stronger folks have an advantage (remember, please, that the roll is not to hit; it is to further your goal, which in this case encompasses both landing the blow and inflicting physical punishment).  Dexterity relates to how well you can place the blow, so more dexterous folks have an advantage.  By adding these together, you have the default attack modifier.  Someone strong and clumsy might have the same modifier as someone who is weak, but a dead-shot.  This is intentional.  

If both of those fellows deliver checks, the results should be narrated differently however.  The strong guy might have just hammered his opponent on top of the head, while the dexterous guy might have deftly jabbed his foe three or four times, each time throwing him off a bit.  The interpretation of the contest roll should be influenced by what attributes are used and in what proportion.