Skill based
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A Skill based system tries takes a different approach then a Stat Based system by only having ranks decide what your character can do. This is an attempt to show training and knowledge of a subject is better then having one overwhelming talent, for instance dexterity governs open lock in D&D. If a person with poor dexterity and max ranks in open lock try to preform the skill they will probably fail it due to their low dexterity even though they are devoted to opening locks. Another reason to this approach is to give more variety between characters with a large list of skills. While this seems to work on paper it almost always replicates the problems with stat based systems in some skills becoming the equivalent of a God Stat while others are next to useless under RAW and become a Dump Stat. Skill based systems often require having full knowledge of the system when designing a character as choosing too may of the wrong skills will seriously hurt the wrong party.