With the rise in women’s part-time work in many Western industrialised countries, a better understanding of women’s employment decisions necessitates the distinction between different employment levels and varying structural opportunities that facilitate or hinder female employment. This article analyses for Switzerland how structural factors affect women’s decisions to work marginal part-time, substantial par t-time, full-time or to stay out of the labour force. The analyses are based on the Swiss Labour Force Survey. The logistic regression findings show that labour market and firm-related opportunity structures affect the three types of employment levels differently. They also play a much larger role in the probability of working marginal part-time than in that of working substantial part-time or full-time.Buchmann, Marlis, Irene Kriesi & Stefan Sacchi (2009). ‘