Hei, Is it possible to use a <select multiple="True"> for a conditional? I'm trying to use it for checkboxes which by default have to have multiple set. But as soon as I put the multiple-tag in I get an 'no case matched' exception (see example below). Any suggestions? Tim Example (working) <conditional name="c1"> <param type="select" name="dbt" label="Db tools"> <option value="blast">Blast</option> <option value="fasta">Fasta</option> </param> <when value="blast"> ... </when> </conditional> Example (exception) <conditional name="c1"> <param type="select" name="dbt" label="Db tools" multiple="True"> <option value="blast">Blast</option> <option value="fasta">Fasta</option> </param> <when value="blast"> ... </when> </conditional> => Exception: ('No class matched value:' , 'c1' , None)