Mixed research methods

Mixed research methods or multi-methodology is an approach to the collection data combining both quantitive and qualitative research theories. In theory this technique looks valuable and effective in collecting information providing details of both numerical and statistical foreground and also providing a backbone of human behaviour.

It provides a complete conclusion on the research data gathered and gives a more complete view and is used when either quantitive or qualitative don't provide a complete aim of which you were first attaining for prior to testing, it can identify a list of strengths and weaknesses when as a solo quantitative or qualitative method would be unseen.
It may also offer a route along which you can follow into deeper understanding as you have evidence from these two varying sources and may go beyond the single approach of quantitive or qualitative.   

In conclusion I believe that this method of mixed research is effective when one wants to gain a deeper understanding and a more specific identifiable response not attainable through quantitative or qualitative alone.