Qualitative Study on Borderline Personality Disorder

How to maintain validity and reliability in a qualitative study on two groups with the use of a questionaire and a survey?

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Thank you. The study is qualitative and will be using the Childhood Interview for Borderline Personality Disorder and the BPD Features Scale. Participants will be group according to socioeconomic statuses and categorized into two groups- 1 for low SEC and 1 for middle-upper SEC.