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How can I define a quota for the other option in my survey? When defining a quota, the available options appear but the other options do not? I want to keep the other option to a certain number. Is it possible?

Use a hidden equation question to evaluate the "Other" value and place the quota on that.

Thanks a lot. How can I find additional information about this equation?

The equation would depend on your requirements which you have not clearly defined.

More info:

- manual.limesurvey.org/Question_type_-_Equation/en

- manual.limesurvey.org/ExpressionScript_-_Presentation

It's nearly the same as in your "age group" equation.
You set a certain value if the "other" option was selected and another value if not.

Activate your survey, ennter some data and have a look at the response table.
You will see how you have to access the variables because it's different depending on your question type.

Joffm