These family lines respectively accumulated practical disciplines such as 'karei' (family customs) and 'shoshi rei' (officials customs) and became highly specialized, and in the medieval period, they assumed certain job grades almost by heredity.
これらの家系は独自に「家例」「諸司例」といった実践的な規律を蓄積し高度に専門化することによって、中世において特定官職をほぼ世襲するようになった。