What is the importance of research within the confines of criminal justice?

(2) short answer essay questions(can you please separate)

Question 1 -Describe the three major types of research design. What are some of the reasons researchers might choose one design over another? How might research design relate to a study’s validity?

Question 2-What is the importance of research within the confines of criminal justice? Give an example of a researched topic that has helped make advances in how some crimes are handled, i.e., Domestic Violence.