I'm doing a vignette study with 3x6 design. I have 6 scenarios that can all occur in 3 different conditions. One person sees all 6 scenarios, but it is randomised in which condition every scenario will be presented (e.g. first scenario in the second condition, second scenario in the first condition etc.).
The problem I have is: how to make sure it doesn't happen that one participant get e.g. all scenarios in the first condition? I want to make that every participant sees all three different conditions, at least once, and it is not important in which scenario. E.g. that would be the case if all three conditions show up twice (3x2=6). I already set the criterion that conditions are represented evenly within the scenario, but what I want is for all scenarios taken together.
Do you have any advice on this? Thank you!
Setting a condition how many times one experimental condition is shown
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So the problem is, how do I ensure that NK, WI and K occur at least in one of the six scenario blocks for participant X. 