The aim of this book is to analyse the stages of the student internship for professional training. The professional demands of the labour market in contemporary society mean that the various higher education and vocational training courses include theoretical and practical activities in their syllabus so that students complete their studies with increasingly complex work and tasks, involving procedures that harmonise theory with practice. In the course of the research, it was possible to understand: the reasons for the replacement of employed workers by trainees, the low quality of monitoring and assessments, the reasons for the growing number of trainees in the formal labour market and their distortion. The absence or non-existence of the coordination and monitoring stages has led to the mischaracterisation of the institute.