Hi there @wernstrom,

Great question! Hope I can clarify.

If you use a multi-checkbox option on a preferences page or form, that will get passed into a profile as a "list" data type. Here's a quick breakdown of how that would look: 
Customer A selects "yellow" and no other color 

They'd get a profile property like this: Interests: yellow

Customer B selects "yellow" and "green"

They'd get a profile property like this: Interests: yellow, green 

You could then create a segment like this: 

Properties about someone > Interests > contains "yellow"

Both customer A and B would appear in this segment. 

If you want to have a separate property for each interest, you'd need to include those as Radio buttons instead.

From there you would just create a segment for whichever you are looking for.

Hope that helped!
Alex

Thanks @alex.hong , definitely want to keep the options for multiple selections open, but understanding the function of “list” as a data type helps a lot.