| Well, it's like this
Only humans can dual class. When you dual class, you stop progressing in the first class, and start as a level 1 of the new class, albeit with the hitpoints you already had. Once you become one level higher in the new class, you can use your old class abilities. So, for instance, a level 9 human fighter (with appropriate stats) could sual to mage, and then once they'd reached level 10 as a mage, they could use fighter type weapons, would regain their fighter THAC0, etc. All dual class combos must be valid multi-class combos, so no monk/mages or paladin/sorcerors.
Multi-class is available only to non-humans, and they split experience equally between two or three classes. Multi-class combinations are limited, so a ranger can only multi-class as a cleric, for instance.
There are advantages and weaknesses to each, versus single-classed characters. Jan, Jaheira, Aerie are multi-class, and Anomen, Imoen, Nalia are dual class.
That's it in brief.
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I have given up all lesser evils as inadequate to my purpose.
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