The aim of this undergraduate thesis is to present the implementation of the integrated managing system in PIK Vrbovec plus company, to present the demands of the ISO 9001:2015, ISO 14001:2015 and ISO 50001:2018 norms implemented in the same company and to describe the integrated quality, environment, energy efficiency, health and security quality management system. The thesis consists of 4 chapters: ▪ After the introduction, the development of the observed norms in the single integrated management system are described in the first chapter. The encompassed norms are ISO 9001:2015, ISO 14001:2015 and ISO 50001:2018. ▪ The foundations of the international norms (PDCA circle) and the management principles of the observed norms are elaborated in the second chapter. ▪ Similarities and differences of integrated management systems i.e., methodologies of PAS 99 and Annex SL are looked at in the third chapter. ▪ The integrated management system (IMS) in the PIK Vrbovec plus company, its implementation methodology according to the norm articles and the compatibilities of the observed norms within the overall integrated management system are presented in the fourth chapter. Challenges advantages and disadvantages of the integrated management system are considered in the conclusion of the thesis and it brings us an overview of the used literature.