Women’s workforce participation increased strongly over the 1980s and 1990s, especially among middle aged wives. Multivariate analysis of IsssA data (N=9412) reveals large compositional changes and a trend for succeeding cohorts of women to work more than their predecessors, but few if any period effects. Among the compositional changes, rising women’s education and falling fertility substantially elevate women’s workforce participation and hours worked. No clear time effects were associated with particular policy initiatives. Importantly, interaction tests suggest that the effects of education and of family situation have not changed over time. Finally, family of origin and religiosity have both direct and indirect effects.