A well-founded chapter on the theoretical framework, also referred to by universities as the theory, literature background, or theoretical context, forms the scientific foundation of your thesis or dissertation. It connects insights from existing literature and secondary research into a clear conceptual framework. It defines key terms and central concepts, demonstrates their interrelationships, and explains which theories guide your research question(s), hypotheses, and the interpretation of your findings. This guide takes you through the essential elements, common pitfalls, and a practical step-by-step structure that you can adapt to qualitative, quantitative, or mixed-methods studies.