Set max number of responses to a multiselect text field

Try this as a new Formula Numeric field.  I would put it beside the multi-select field on the form.  If you wanted to limit to 5, 


var text Multi = ToText([My Multi Select Field]);

Count(
Part($Multi,1,";"),
Part($Multi,2,";"),
Part($Multi,3,";"),
Part($Multi,4,";"),
Part($Multi,5,";"))

Then make a form rule to abort the save when the record is saved and there are More than 5 selected.

------------------------------
Mark Shnier (YQC)
Quick Base Solution Provider
Your Quick Base Coach
http://QuickBaseCoach.com
mark.shnier@gmail.com
------------------------------