It would be best to add the code on your scratchpad to the end of your previous node: for posterity, you know. Anyway, the problem seems to be with the HTML (as originally pointed out by theorbtwo in the CB): you have named all of your checkboxes "drive", so in order for your code to work you need something like (and this is untested):

my %hash = (Initiative=>'DriveInitiative',
            ResOrientation => 'DriveResOrient',
            Creativity => 'DriveCreativity',
            ChangeOrientation => 'DriveChangeOrient',
            DecisionMaking => 'DriveDecisionMake',
            SelectLevel => 'ResLevel',
            ManagesPeople => 'ResManage');
my @checked = split /\0/,$cgi->param('drive');
my @clauses;
foreach my $checkbox (@checked) {
   push @clauses, $hash{$checkbox} if validate($checkbox);
}
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rdfield