Qualitative research design involves formulating a research question, selecting participants, collecting detailed data through methods like interviews or observations, analyzing the data for patterns and themes, interpreting the findings within the context, enhancing trustworthiness, reporting the results with rich descriptions and quotes, and reflecting on the process for future research directions. 

Quantitative research design entails formulating a research question, identifying variables, selecting a representative sample, collecting numerical data, analyzing it using statistical methods, interpreting the results, considering generalizability, and reporting the findings in a structured manner. 

The purpose of qualitative research design is to explore and understand the subjective experiences, meanings, and social contexts associated with a particular phenomenon. It aims to generate rich and detailed insights, capture the complexity of human experiences, and provide a deeper understanding of individuals' perspectives. Qualitative research design allows researchers to delve into the nuances, interpretations, and contextual factors that shape people's behaviors and perceptions. It is often used to explore new areas of research, generate hypotheses, inform theory development, and provide a more comprehensive understanding of human phenomena. 

The purpose of quantitative research design is to measure and analyze numerical data in order to quantify relationships, test hypotheses, and make statistical inferences. It aims to provide objective and generalizable findings by using structured data collection methods and statistical analysis techniques. Quantitative research design focuses on establishing cause-and-effect relationships, making predictions, and drawing conclusions that can be applied to a larger population. It is often used to provide precise and measurable results, inform policy decisions, support evidence-based practices, and contribute to the body of scientific knowledge in a systematic and rigorous manner.