Following the regression analyses with the caregap as the dependent variable, which focused on unpaid work, the conjoint analysis will now broaden its scope to include gainful employment and care. The dependent variable is the elasticity in time allocation under a given policy setting, specifically the extent to which a father adjusts the time he invests in paid and unpaid work. This chapter aims to investigate causality and answer the third sub-question regarding the impact of leave policies on fathers’ time allocation: Do specific parental leave policy designs have the potential to induce changes in paternal behaviour, particularly in altering the distribution of paid and unpaid work time, and what characteristics define these designs?