There has been an error in the display of this page. There has been an error in the display of this the nav. There has been an error in the display of this page. Merging Theories and Methodology: Key Terms The following terms are essential in order to complete the exercises in this unit. Click on the term to see its definition. Biography Cohort study Cross-sectional research Generalizability Integrative criminology Longitudinal research Participant observation study Qualitative research Quantitative research There has been an error in the display of this page.