The Undocumented Workers Transitions (UWF) project has produced six thematic reports: (1) Un(der) documented migrants labour: characteristics, conditions and labour market impacts; (2) The relationship between legal status and working conditions; (3) Migrants labour in the underground economy: Between processes of irregularisation and informalisation; (4) The underground economy and the impact of the informal opportunity structure; (5) Human and social capital; (6) Female migrants – the new nomads in old Europe.