Does Singer not fit a specific type of utilitarianism? Just the same as, "The lines of distinction between metaethics, normative ethics, and applied ethics are often blurry." (iep.utm.edu/ethics)

This document uses both with "preference act utilitarian:" https://www.amherst.edu/media/view/107894/original/TD2-Master%2BDocument-Euthanasia.doc

Does it change when considering different ethics, such as animal rights or just ethics in general:

Act-utilitarianism is the specific form of utilitarianism which Singer adopts, and it is characterized by its concern with the utility of acts; that is, whether any single action will, both in the short and long term, cause pleasure or pain, and to what degree.


  • Please do not just link sources but quote relevant bits of information. Links can disappear, your question should remain understandable without them.
    – k0pernikus
    Commented Jan 9, 2014 at 22:53
  • This is incomprehensible.
    – iphigenie
    Commented Jan 10, 2014 at 16:18
  • @k0pernikus The second link is from the Web Archive. The question is merely supplemented by the links.
    – adamaero
    Commented Aug 28, 2016 at 0:21

3 Answers 3


I think the previous answers are now outdated in one respect. My understanding is that in Peter Singer's 2014 book The Point of View of the Universe (coauthored with Katarzyna de Lazari-Radek), Singer changed his position from preference utilitarianism to hedonistic utilitarianism. Although I haven't read the book, I have looked at a review of it in Notre Dame Philosophical Reviews by Bart Schultz. Here is a relevant passage of the review (Note--the first part of the quoted sentence is not directly relevant to the question, but just gives context):

Restoring Sidgwick to his rightful place of philosophical honor and cogently defending his central positions are obviously no small tasks, but the authors are remarkably successful in pulling them off, in a defense that, in the case of Singer at least, means candidly acknowledging that previous defenses of [R.M.] Hare's universal prescriptivism and of a desire or preference satisfaction theory of the good were not in the end advances on the hedonistic utilitarianism set out by Sidgwick.

I believe that the phrase "previous defenses of Hare's universal prescriptivism and of a desire or preference satisfaction theory" refers to Singer's previous defenses of those views (which he now rejects).

As the previous answers noted, 'act' in 'act utilitarianism' and 'preference' in 'preference utilitarianism' are not parameters along the same dimension. The OP appears to have been confused on this point. Versions of utilitarianism differ along a few dimensions.

Along one dimension there is debate about what human (or animal) well-being consists in. Positions along this dimension include but are not limited to (I'll stop saying this) hedonistic utilitarianism, preference-satisfaction (or desire-satisfaction) utilitarianism, and eudaimonian (I believe this is similar to so-called 'objective list theories') utilitarianism. Of course, there are still further debates within these positions.

Along a second dimension there a debate about the structure of utilitarian theories. Positions along this dimension include act-utilitarianism, rule-utilitarianism, as well as Donald Regan's so-called cooperative utilitarianism.

Perhaps a third dimension is the scalar versus binary dimension of the moral status of an action (although I know less about this). I think scalar utilitarianism says that some acts are better and worse than others (perhaps better or worse to certain degrees) but that there is no cuttoff between a right act and a wrong act or between a permissible act and an impermissible--indeed this view rejects the notions of right, wrong, permissible and impermissible. By contrast, binary utilitarianism finds these distinctions to be important in some respect.

A fourth dimension arises in settings where the population size is not fixed. Positions here include total utilitarianism, average utilitarianism, etc.

(There are probably other dimensions too but I'm getting away from the question now. Also some of these dimensions apply also to non-utilitarian ethical theories.)


The act vs. rule has to do with the unit of analysis--are you calculating the consequences of the individual action or the type of action.

Hedonism vs. preference has to do with a different question: What is it that you think is intrinsically valuable, happiness or the satisfaction of our preferences?

Singer used to be act, preference utilitarian. He is now a hedonistic utilitarian.


Peter Singer is a preference utilitarian as he expounds in his famous book, Practical Ethics. The author of the first document you cited also defines Mr. Singer as a preference utilitarian:

Preference utilitarian Peter Singer argues that, most likely, each person is more qualified than anyone else to know what is in their own interests as long as they are competent (thus, parents probably know more than their infant child about what is in their child’s interests).

The author is trying to argue that there is a fundamental division between act and rule utilitarians, and that these utilitarians are then further divided into flavours, such as preference and hedonistic:

[...] a hedonistic act utilitarian thinks that an action is morally right if its effects help to maximize the sum of every being’s happiness.

And a hedonistic, rule utilitarian thinks that an action is morally right if it conforms to a set of rules that, when generally followed, help to maximize the sum of every being’s happiness.

Finally, a preference act utilitarian thinks that an action is morally right if, in the long run, it satisfies more informed preferences than it frustrates (with deference to the importance of those preferences).

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