I am currently conducting my masters thesis using qualitative semi-structured interviews with industry experts. I have conducted 8 one-to-one interviews so far. The 9th participant who accepted to participate in my research would like to have another colleague during the interview process to collectively answer the questions. Is this method going to be acceptable/ or unacceptable in semi-structured interviews? Can I combine the one-to-one and group interview method in the same research? Are there any ethical issues involved?

Thank you!

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