We do have a beta feature available that can be enabled to help address this issue. If you go to https://www.polleverywhere.com/labs and enable the option for “Disable duplicate responses” this will allow participants to respond with multiple options to a single poll question without allowing them to select the same option multiple times.
It’s our initial foray into this type of poll type or option. It does still count toward the ultimate response limit which is the base of most of our pricing right now and is therefore tricky to change. It is part of a longer term plan to change our count limit to individual participants, however that will still be some time away unfortunately. It will be a significant project for us with a lot of risks.
Thanks for the feedback, sorry I don’t have better news for you just yet.James O'Donnell commented
There should be an easy way for students to enter in multiple choice answers. While sending two answers via cell phone via separate texts may be hard to sort out in terms of billing plans, that problem would be averted if a student just sent both answers in a single text. (That currently triggers an error message.)
For example, if the correct answers were A and C, then the text would be "AC" or "CA". The software from poll everywhere should be able to sort that out. And it seems pretty easy for a software program to distinguish the number of users versus the number of answers submitted
As others have said, "Select All" questions are a fundamental way to assess students.