This has led to inequalities in opportunities and outcomes for personal and professional development. Research on time use, and particularly the analysis of time-use survey data, has revealed patterns of inequality in time distribution and allowed the quantification of time allocated to daily activities. It has also identified the conditions that affect time distribution and allocation for specific tasks according to the rules of the patriarchal system within families and the dominant gender system in the public arena, providing statistics to reflect unpaid domestic and care work and their effects on the lives of women and on gender relationships.