First, I would like to make an assignment based on a specific answer in the survey. However, this assignment should not be made directly afterwards, but only later in the survey.

You can make the assignment at any time in the survey flow.

The second question is about the creation of the Attention Question. I would like to send the people who answered the question incorrectly back to the intro and send them a message via a pop-up window.

Qualtrics isn’t designed to go back to the beginning of a survey. Depending your survey settings, it is possible to end the survey and redirect to start it over. You’ll need to use JavaScript to do a pop-up alert.

Hi TomG, 

thank you for your response and the help! 

Considering the first question, we would like to ask them a specific question and according to their answer they should receive later in the survey different questions. That means I would not sent them directly to a block of questions, but later on in the survey. Do I have to create two parts of the remaining questions, or is it possible to send separate them later on? 

The questions you want to ask later must be in a separate block. You would place the block under a branch in the survey flow based on the answer to question earlier in the survey.

I understand that! The question is, I would like to ask both the same questions after the decisive question, but later in the survey there should be a different block depending on the answer, i.e. a link to future questions and not directly afterwards.