Hi John, You're on the right track with the SUM; I use that approach. However, once a custom parameter has data added to it, its datatype cannot be changed, as you are seeing. So! I'd suggest you either: - add new calculated numeric parms that read the existing yes/no parms to convert them to a 1/0, then switch your reports to use the 1/0s to get the sum you seek, or - add a new similarly-named (eg yesnopam_as_number) numeric parms, group by Yes/No, bulk update each Yes to 1/No to 0 values, drop the Yes/No parms, then rename the 1/0 parms to the old yes/no names so your existing reports sum as you'd intended Regards, Doug