I have three condition categories (e.g. pothole depths of <80mm, 80-150mm and >150mm) and, people need to describe the condition of a section of road by selecting values from a dropdown list for each condition category. That all works nicely, however, I would love to be able to ensure that the three percentages add up to 100%, not more, not less. Is there a way to achieve this?
There is not a built in option to force a 100% value (to do so with this specific question type you would need to use Custom Scripting):
However, if you are open to using a different question type, the Continuous Sum question will allow you to accomplish this (albeit in a different format):
Hope this helps!