public function formula_evaluation( $section, $message, $source )
	{
		if ( ! $this->log ) return;
		$message = "$section $message";
		$this->log->_announce( array( 'section' => $section, 'priority' => PEAR_LOG_INFO, 'message' => $message, 'source' => $source ) );
		$this->log->info( $message );
		return $message;
	}