It is widely accepted that an appropriate combination of quantitative and qualitative methods provides a better understanding of research problems as opposed to using them separately. This mixed approach is trying to cover any gaps and weaknesses between the quantitative and qualitative research. Furthermore, triangulation is a common way to combine quantitative and qualitative approaches, which has been used in numerous studies in order to detect different aspects of the research question as well as because the deficiencies of one method are often the forces of the other. The use of multiple methods reflects an attempt to understand and study the phenomenon under in depth investigation, while triangulation is not as much a results-validation strategy, but more of an alternative proposal for validation, through which the breadth, depth and consistency of the methodological processes is increased. There are different types of triangulation, but a mainstream process may include but is not limited at: (a) data triangulation, (b) investigator triangulation, and (c) methodological triangulation, in the version of triangulation of methods belonging to different paradigms. This paper will study and analyze the importance of mixed methods in political science and especially in governance and public policy research by focusing on specific examples of related research and outcomes. The main reason is to assess the importance of mixed methods in achieving better understanding of the social problems and transitions in the post-covid-19 era and thus shed light in contemporary issues related to governance and public policies.