Yes, but

If your free text answers are rich enough that you are able to adopt some qualitative method, in order to disentangle underlying menings of statements, your analysis might be called qualitative or mixed methods. In a nutshell, data collection is strongly influencing your analysis, and part of the analytical process, but should not be confused with actual analysis of material

Yes, but

If your free text answers are rich enough that you are able to adopt some qualitative method, in order to disentangle underlying menings of statements, your analysis might be called qualitative or mixed methods. In a nutshell, data collection is strongly influencing your analysis, and part of the analytical process, but should not be confused with actual analysis of material

The suitability of your tools depends mainly on the type of data evaluation and analysis (how are data coded, which instruments are used for pattern recognition, etc.). Tool No. 1 and No. 2 are certainly very close to each another in terms of results achievement, so that the question arises whether one can go on without one of the tools. Possibly, open (preliminary) in-depth interviews would be helpful in order to develop or check your theoretical framework. And just as a side note: Question example c contains more than one question, so the answers may not be clearly interpreted. Many greetins and success to your project, Axel

Jerry, the choice of which types of interview questions you use in a qualitative study such as the one you are intimating is largely dependent on your topic area, the research question(s) and research objective(s). Question choice could also be premised on what you are trying to find and the extent to which the ultimate findings will contribute to the development of knowledge in your topic of study. Interesting...

Your research can be qualitative or quantitative or mixed between the two methods. In-depth interviews are largely used in exploratory research, which can be defined as the process of investigating a problem that has not been studied or thoroughly investigated in the past .

Yes. You can use both, as per analysis pattern and your framed objectives. After, pilot study(if any), you can be in a position to adopt the tool. Even in structured tool, many scholars add some open ended questions to get more information.

Jerry Okundaye, There are three research methodologies: mixed-methods, quantitative, and qualitative research methods. The mixed-methods is a combination of qualitative and quantitative research methods. You sounded as if you are using mixed-methods because you mentioned using questionnaires, interviews, and secondary sources like documents. If you are using qualitative research (by using interviews and documents), stick to that. If it is quantitative research (by using survey questionnaires), then stick to that. If it is mixed methods (by using interviews, questionnaires, and documents), then call it mixed-methods research. Don't get confused by mixing it up and calling your research a wrong name

To add to the previous answers, I would clarify first what do I want to find out - closed questions provide you with different answers and data than open questions. Also, you would need a coding strategy for open questions.

Yes. But their will not be any sequence. The clarity if the idea will be poor

Yes. Please do validate your questions through a focus group.

Yes, you may use. Just have in mind that it is very hard to analyze and intepret "open-ended" questions.

Yes, you can. Still, I would set up a coding strategy for the open questions beforehand. Good luck!

Yes,

Definitely, Yes.