This document outlines the key components of a research design, including the purpose of the study, types of investigations, extent of researcher interference, study setting, unit of analysis, and time horizon. The research design provides an overall framework and blueprint to guide the investigation and identify information relevant to addressing the research problem. The purpose can be exploratory to discover ideas, descriptive to characterize variables, or testing hypotheses about causal relationships. Studies also differ in the level of researcher interference, whether settings are natural or contrived, the unit of analysis (e.g. individual or group), and whether they use a cross-sectional or longitudinal time horizon.