Paragraphs needed to add to Chapter 3 proposal

Please justify the research method and design. 
Add to Chapter 3: 
Rationale for a Qualitative Methodology
          Please talk about quantitative method and state why it is not suitable for my study; APA style required for citations;

Rationale for Research Design
        Please talk about all other kinds of research designs( for example case study), and explain why they are not suitable for my study; APA style required for all citations