Jean Piaget yefka azal i unelmad i wakken ad yessaxdem timusniwin-is deg yisental ara yessaqdec, anelmad yettak azal u yettkel ɣef yiman-is, yesɛa awal-is deg ulmud-is, i xeddem ayen ara tissiwḍen kan ɣer yiswi-s.