public function setSimpleAssociableChoices(SimpleAssociableChoiceCollection $simpleAssociableChoices)
    {
        if (count($simpleAssociableChoices) > 0) {
            $this->simpleAssociableChoices = $simpleAssociableChoices;
        } else {
            $msg = "An AssociateInteraction object must be composed of at lease one SimpleAssociableChoice object, none given.";
            throw new InvalidArgumentException($msg);
        }
    }