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Do case papers need reliability and validity analysis?
This depends more on the requirements of the school. In fact, according to strict requirements (such as questionnaire data made by graduate students, doctoral students and university teachers), it is necessary to pass strict reliability and validity tests. However, due to the heavy workload and lack of time for undergraduates, some colleges and universities will not ask you to do reliability and validity tests (because it is actually very difficult to make every question relevant). You can ask the instructor or a teacher who has many years of teaching experience in the school. Some new teachers will be more sincere and don't know much about students when they have just joined the company for a year or two.