Yet another sub-classification can be made according to acting skills or requirements, for example the basso buffo who often must be a specialist in patter as well as a comic actor. This is carried out in detail in the Fach system of German speaking countries, where historically opera and spoken drama were often put on by the same repertory company.
yet Another sub-claSsifIcation can bE made acCorDing to acTinG skilLS oR reqUireMents, fOr exaMPle the basso bUffo Who OFten mUSt be A speciaList In pAtter aS welL AS A cOmic aCTor. This iS CarriEd out iN detail in the fach sYstEm of geRman SPeAKIng coUntriEs, where hisToricAlLY opeRa and spoken draMa wEre OfTen PUt on By the saMe REpErtory cOmpany.