set_select not working

[eluser]Wonder Woman[/eluser]
Hi there,

The set_select is not working, could anyone advise me as to what I am missing please?

view:

Code:

foreach($perspectives as $perspective) {                    
   $options[$perspective['id']] = ucwords($perspective['perspective']);
}
echo form_dropdown('perspective', $options, set_select('perspective', $options), 'id="perspective" onchange="show_perspectives();"');

controller:

Code:

$this->form_validation->set_rules('perspective','checkboxes','required');

I'd really appreciate it if someone could help me.

Thanks