I have a select_multiple variable on my ODK form. 1.I want to count the number of options selected during data capture 2. I also want to know which options are selected so as to valid some other responses during the interview. any ideas.

I think you will want to explore the count-selected and selected functions. See the "Operators" section on this page for examples. In the future, please do use the support template to get the best help possible! You can read more in About the Support category .

form-design, odk-xlsform

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Counting the number of options chosen on a select_multiple variable