Research discussion: What is a research design?

What is a research design? What is its function? What are the two main types of research methodologies? How are they carried out differently? Identify one quantitative design and one qualitative design discussed in the Required Readings for this unit that might be useful for your own study. What would implementation of those types of designs require from you as the researcher in terms of how you would carry out the study and the instrument you would use to collect data?