sub start {
  my ( $self ) = @_;
  my $query = $self->query();
  my $foo   = $query->param( 'foo' );
  my $bar   = $query->param( 'bar' );
  my $baz   = $self->param( 'my_param' );

  my $start = Start->new();
  $start->output( qux => $foo, quux => $bar, corge => $baz );
}