what are mixed methods design, homework help

Methodology is that in which combines qualitative and quantitative research. This very strongly makes an implicit case for the complementary nature of both qualitative and quantitative methodologies,called mixed methods designand this gives us a great opportunity for us to discuss.This is the idea that the two forms of research can complement each other: qualitative research can give a wealth of information that can then be tested quantitatively to establish validity and reliability and causation.Using both methodologies in one study is called a mixed methods design.So.......questions:1. What are mixed methods design and how do they work so we're all familiar with the term and the design?2. If mixed methods design is SO great, why is it not used more often?