Our review is about György Kiss's book, its title being Employment Flexibility and the Protection of Employee Status (A Possible Approach to Examining the Content of the Employment Relationship). The work raises the question of the future of labour law regulation, using the results and findings of the past. After describing the roots of Roman law, we can learn about the development of the current form of labour law through the development of the Germanic, Francophone and Anglo-Saxon legal systems. In addition to the historical view, the dogmatic foundations are also outlined in the work, so the content processing of the employment contract takes place on several levels before the author discusses the labour law applicability of the relational contract theory he raises. The description of all these bases makes the work suitable for those interested in labour law to better understand the contractual theories of different legal systems. We want to give an insight into this in the review, so that in addition to presenting the work, our own personal views and opinions will also appear.