Randomly allocating each respondent to one out of 2 branch options

Hi Eyal,
In your Survey Flow, you can add a Randomiser which randomly presents 1 element to the user while trying to evenly present the different flows across all users.
https://www.qualtrics.com/support/survey-platform/survey-module/survey-flow/standard-elements/randomizer/
These elements would then be your two possible survey flows. I would use Groups after the Randomiser in order to group multiple questions.
What I also advise is to add an embedded data variable so you can very easily keep track how many respondents were assigned to which flow. For example "surveyflow = A" in group A, "surveyflow = B" in group B. Then you can also Edit the Count once in a while to account for respondents not finishing the survey and therefore skewing the even distribution of the flows (should this be necessary).
In a nutshell:
Randomiser presents 1 of the following 2 elements (evenly): Group A or B

• Group A


• set embedded data "surveyflow = A" (optional)


• Question 1


• Question 2


• ...


• Group B


• set embedded data "surveyflow = B" (optional)


• Question 1


• Question 2


• ...