This document defines and classifies different types of marketing research designs. It discusses exploratory research design, which aims to provide insights and understanding through unstructured processes like expert surveys, case studies, and focus groups. Descriptive research design attempts to describe market characteristics and functions using secondary data analysis and surveys. Causal research design tests hypotheses about cause-and-effect relationships through experiments to understand independent and dependent variables. The document provides objectives, characteristics, methods and uses for each type of research design.