The Right and the Good is a classic of 20th Century analytic moral philosophy. Ross defends a version of intuitionism, whereby, he claims, certain duties are self-evident. For example, the duty to be benevolent or the duty to keep promises, etc., are self-evidently prima facie duties. In a particular context the agent must use judgment to determine which prima facie duties are most relevant in order to determine which act is appropriate.
Without addressing the distinction between the right and the good, the arguments for which are not entirely compelling, it is worth briefly commenting on the notion of self-evidence operative in Ross's theory.
He recognizes that the self-evidence of a prima facie duty may not be apparent to some or even many persons and may take time and effort to be grasped. In this sense, one might say, following Aristotle (who is clearly a source for Ross) that these duties are self-evident to the wise. In this sense, Ross's intuitionism is far from absurd. Given the appropriate conditions, appropriately socialized persons will find a range of duties to be obvious, without further need of elaboration or defence. Bernard Williams noted that rationalist ethical theories often required 'one thought too many,' such that they posited a need for a reason when the ethical person would not need a reason, for instance a reason to save a drowning spouse. In such a case of urgent need, appeals to the greatest good, or the categorical imperative are out of place and the ethical person ought to recognize the needed action without need for further argument.
What is missing from the intuitionism of Ross is an account of (a) the virtues needed to recognize these duties, (b) the social conditions needed to acquire these virtues, and (c) an explanation of why the combination of social conditions and duties that are self-evident to the wise in those social conditions are rationally justified and superior to alternative sets of duties and social conditions. Hegel and MacIntyre offer some insight into how this last issue might be addressed.