Tommy Isidorsson is Associate Professor, Work Science, University of Gothenburg, Sweden and Member and Supervisor at ChangingEmployment Marie Curie ITN. His main interest has been how firms and organisations adapt to changes in demand, i.e. the different strategies utilised for handling changes in production volume including working-time flexibility, functional flexibility and numerical flexibility. His interest in numerical flexibility includes several studies on agency workers focusing on mechanisms that influence the development of these strategies for flexibility and their consequences on a societal level, workplace level and individual level. He is the author of many publications on temporary agency workers. Julia Kubisa, Marie Curie Experienced Researcher, Post-doc at University of Gothenburg, Sweden, Assistant Professor at the Institute of Sociology, University of Warsaw, Poland. For her PhD she researched women’s activation in Polish trade unions, focusing on the position of nurses and midwives in the Polish healthcare system and their patterns of protest, the impact of healthcare system reform on working conditions and trade unions’ activities. Her research interests are in the field of the sociology of work, including the gendered division of labour, labour relations in transforming economies and new patterns of job quality.