Pre- and Posttest design

Question

Hi there. I am designing a simple pre- and posttest study. The participants will answer some questions and after a month or so, they will answer the same questions (or another modified questions). It means that I will have 2 questionnairs. Participants A-Z will answer the first questionnair and the answers will be sent to us annanymously. In the second round, participants A-Z will send the replies. The problem is that as the replies are annonymous, I will not be able to compare the first with second replies/questionnairs from participant A to evaluate the changes that has happened in replying to the questions. Is there a way to solve this problem? Thank you very much in advance.

Answer 1

There are at least two different options.

Option 1: Request of a Personal Code in both questionnaires.

Option 2: Multi-Wave Surveys with Self-Recruited Respondents

Comments

Unfortunately, I could not find any option in the variables or questionnair section to add a "Personal code" option. Should I add it as a variable? If yes, please guide me to which kind of a variable exactly. Or should I add it at the final step of creating the questionnair?

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In  my answer abover, there are two links into the manual (directly after the "Option:"). The manual hen explain step by step how to implement either option. Let me know, should you get stuck anywhere on the way.