This chapter provides an overview of possible avenues for research in relation to various key economic-psychological problems. Theoretical research mainly comprises (mathematical) modelling of economic psychological processes. The starting point for theoretical research often is literature search and observation of behaviour. A common distinction in empirical research methods is between qualitative and quantitative methods. There are a number of qualitative methods. The chapter gives an overview of the most frequently applied qualitative methods in economic psychology by describing typical examples of research applications, that is, in-depth interviews, focus groups, and content analysis. When constructs have been defined in the beginning stages of research, quantitative data analysis becomes feasible. The chapter also gives an overview of the most frequently applied quantitative methods in economic psychology by describing typical examples of research applications, that is, test construction, surveys, observations of economic activity, experiments, physiological and brain methods.