This ebook examines different aspects of labour market flexibility, spatial mobility of workforce and its effects on labour market flexibility, and factors influencing both labour market flexibility and spatial mobility. Some papers also deal with integration and wage gains of migrant employees. Our intention is to elaborate research mainly in two relatively broad fields with existing research gaps. There is still little research on interactions between spatial mobility and labour market flexibility, despite the fact that some authors (e.g. Monastiriotis, 2005; Paas, Eamets, 2007) find that labour mobility is an essential part of labour market flexibility.