Editing Ogre:CharacterCodex:Introduction (section)

====Aptitudes and Skills====
With this system, aptitudes still represent your general capabilities in a domain, but you never check for aptitudes. Instead, each aptitude is separated in different skills that represent specific action your character can do. When resolving an action, you use your skills to make the checks. Your skill check is done as usual, but you add the related aptitude value to your skill.
For example, you have 3 ranks in your Combat aptitude. You also have 3 ranks in your Melee skill and 2 ranks in your Range skill. When fighting with a melee weapon, you have a +6 bonus to your roll (3 Combat + 3 Melee) and while fighting with range weapon, you have a +5 bonus to your roll (3 Combat + 2 Range).