Obviously such variations reflect historical path dependency, and these play just as large a role in the unfolding of the SDT as they did in producing leads and lags during the first transition. Hence, the SDT theory should not be taken as a teleological grand script with a standard scenario.each of which is anchored to specific empirical evidence.Dissociations between the rise of cohabitation and the postponement of parenthoodValue orientations and household choices:Micro-level evidenceFertility and the SDT: Postponement and recuperation