QS:Random group
From LimeSurvey Manual
Randomization group name (random_group)
Attention : The order of randmization is currently not stored. So you should not give the user an option to save/resume later. This is a limitation that will be fixed in a future version.
Description
Place questions into a specified randomization group, all questions included in the specified group will appear in a random order.
Valid values
Just enter any string you like (for example: 'group1'). All question which have set the same string will have their place in the survey randomized (=randomly exchanged among each other).