How to force users to select two option in ODK Collect

[Kal_Lam]

Welcome to the community @dipendra! Maybe this post discussed previously should help you solve your issue:

Can I just select one option of a *Select Many*

You could do this as outlined in the image below: In the survey tab of your xlsform: [Image 1] In the choices tab of your xlsform: [Image 2] Data entry screen as seen in Enketo: when a wrong entry is made [Image 3] Data entry screen as seen in Enketo: when a correct entry is made [Image 4] Reference xlsform: Dummy Questions.xls (26.5 KB)