As the response to the financial downturn and arising social problems, eco-innovation flagship was elaborated as one of the main building blocks for sustainable, smart and inclusive growth. Nevertheless, the experts are increasingly pointing out that one important link is missing – while focusing mainly on technical innovations and natural environment, social aspect is mostly disregarded. The social aspect includes human, economic, policy, organisational and other interactions in the system. By bringing together these three sectors – social, technical and natural environment –, the author of the present Thesis studied so the called socio-technical system. Currently, the studies using social and technical aspects for the research on transition processes are fragmented, both in terms of studied sectors, used methods, and scientific fields. Especially, in the field of energy research, the majority of the works study techno-economic aspects of the system, while only few attempts have been made to incorporate socio-technical perspective as well. Also a clear lack of a holistic methodology has been identified, therefore the ultimate aim of this Thesis is to attempt to link the engineering and social science study field to create such modelling approach. The Thesis work, therefore, guides through the path of the creation of this methodology. As a case study object, the household sector is used in the Thesis. The complexity of the applied methods was developed over time to match the growing complicatedness of studied research questions. The author of this Thesis views the socio-technical transition processes from the perspective of various sectors, such as energy use, production and management, innovation diffusion, and others. Also, the transitions are looked from the scientific lenses of various possible methods and their combination. And, last but not least, these transition studies are considered from the perspective of various scientific fields, both engineering and social science. The Doctoral Thesis is based on the thematically unified six scientific publications. Those publications are published in various scientific periodicals, and are accessible in scientific information repositories and cited international databases. The goal of these publications is to transfer and approbate the framework of socio-technical transitions. This thesis consists of an introduction and three chapters. In the introduction, the goal of the Thesis and the underlying tasks are given, followed by the definition of the Thesis’s structure and a short description of the approbation of the results obtained by means of the publications and participation in international scientific conferences. Chapter 1 provides an overview of the research questions present in the defined study domains. Chapter 2 describes the methodologies used in the socio-technical transition studies. The results obtained from the application of the proposed methodologies are presented in Chapter 3. Finally, conclusions are given at the end of the Thesis.