Georg W. Oesterdiekhoff
Auguste Comte, the founder of sociology, and Norbert Elias, the last classical sociologist, based their sociologies on the idea that humankind has gone from a stage of childhood to adult stages. The essay shows that there has actually taken place a psychogenetic evolution of humankind in history. Empirical researches across the past generations, namely Piagetian and intelligence cross-cultural researches, have been continuing to support the idea, whether the researchers involved have been aware of it or not. The essay demonstrates further, that the history of society, economy, culture, law, morals, politics, customs, religion, etc. can only be described against the background of developmental psychology.