Dynamic Substantive Methods theorem (Barseghyan-2015)

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This is an answer to the question Static vs. Dynamic Methods that states "All substantive methods are necessarily dynamic."


Dynamic Substantive Methods theorem was formulated by Hakob Barseghyan in 2015.1 It is currently accepted by Scientonomy community as the best available answer to the question.

Broader History

Philosophers of science up until Karl Popper and Imre Lakatos typically believed that there was at least one element of the scientific mosaic immune to change. For most, this static element was believed to be a transhistorical scientific method. Thomas Kuhn and Paul Feyerabend were among the first in the philosophical canon to introduce the idea that methods of science are dynamic, change through time, and that no logical core necessarily persists across major spans of time. Kuhn took a strongly historicist view of science, and insisted that the examination of the history of science shows that the method of theory acceptance can radically change for a community across a paradigm shift.2

By the 1980s, most philosophers of science had accepted that many of the requirements for theory acceptance are dynamic. The example of the placebo effect was used as an example of how theories induce change to the requirements of the scientific method of a community. However, philosophers still hoped that there was a more abstract and fundamental set of static requirements consistent across scientific communities. For adherents to this belief, such as John Worrall, this was typically argued to be a kind of hypothetico-deductivism.

The debate between Laudan and Worrall3456 elucidated the distinction between two questions about dynamic methods. The first was an empirical question: Have there been any methods which have not changed through history? And second, a theoretical question: Are there any methods which are, in principle, immune to change? Both Worrall and Laudan agreed that there exist substantive methods, which shaped by contingent propositions about the world and therefore not static. If theories about the world are to change, then so should these methods. However, Laudan held that no methods have ever been procedural — shaped by only necessary propositions and therefore immune to change — whereas Worrall contented that certain methods, such as the hypothetico-deductive method, are in fact procedural and historically have formed the base of scientific reasoning.

Scientonomic History

Acceptance Record

Here is the complete acceptance record of this theory:
CommunityAccepted FromAcceptance IndicatorsStill AcceptedAccepted UntilRejection Indicators
Scientonomy1 January 2016The theorem became de facto accepted by the community at that time together with the whole theory of scientific change.Yes

Question Answered

Dynamic Substantive Methods theorem (Barseghyan-2015) is an attempt to answer the following question: Are there any methods which are immune to change?

See Static vs. Dynamic Methods for more details.


A substantive method is one that presupposes at least one contingent proposition; one that depends on the state of something in the external world. According to our understanding of contingent propositions, all such propositions are fallible. As such, any substantive method will necessarily presuppose at least one contingent proposition, and is therefore fallible. Thus, by the synchronism of method rejection theorem, the rejection of a theory can result in the rejection of a method, rendering all substantive methods dynamic.

The gist of this theory can be illustrated by the following examples.

Blind Trial Methods

One example is the transition from the controlled trial method to the blind trial method and then to the double blind trial method. Blind trials were introduced as an implementation of the more abstract method that required to account for the placebo effect on patients when testing drugs. Once the placebo effect became known, the method changed. And after, when it became known that the experimenter's bias also had a role on patients when testing drugs, the method changed once more, from blind to double-blind.

Aristotelian-Medieval Method to Hypothetico-Deductive Method

Another example is the transition from the Aristotelian-Medieval Method to the Hypothetico-Deductive Method. While in the former it was assumed that there was an essential difference between natural and artificial, and that therefore the results of experiments, being artificial, were not to be trusted when trying to grasp the essence of things, in both the Cartesian and Newtonian worldviews such a distinction was not assumed and therefore experiments could be as reliable as observations when trying to understand the world. Once the theories changed (from the natural/artificial distinction to no such distinction) the methods changed too (from no-experiments to the experimental method).


Reason: Deduction of the Dynamic Substantive Methods theorem

Here is the deduction as it appears in Barseghyan (2015):

According to the thesis of fallibilism, accepted in the contemporary epistemology, no contingent proposition (i.e. proposition with empirical content) can be demonstratively true. Therefore, since substantive methods are based on fallible contingent propositions, they cannot be immune to change. Imagine a typical mosaic with an accepted theory and a method that implements the constraints imposed by this theory. It is obvious that the method in question is necessarily substantive (by the definition of substantive method). Now, suppose that there appears a new theory that manages to satisfy the current requirements and, as a result, replaces the accepted theory in the mosaic. Naturally, this new theory imposes new abstract constraints (by the third law). It is conceivable that these new abstract constraints are incompatible with the requirements of the current method. In such an instance, the old method will be replaced by the new one (by the method rejection theorem). In short, a rejection of theories can trigger a rejection of the substantive method. This idea has been already implicit in the synchronism of method rejection theorem. Thus, there are no guarantees that an employed substantive method will necessarily remain employed ad infinitum. Consequently, any substantive method is necessarily dynamic.1p. 220


This reason for Dynamic Substantive Methods theorem (Barseghyan-2015) was formulated by Hakob Barseghyan in 2015.1

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  1. a b c  Barseghyan, Hakob. (2015) The Laws of Scientific Change. Springer.
  2. ^  Andersen, Hanne and Hepburn, Brian. (2015) Scientific Method. In Zalta (Ed.) (2016). Retrieved from http://plato.stanford.edu/entries/scientific-method/.
  3. ^  Laudan, Larry. (1984) Science and Values. University of California Press.
  4. ^  Worrall, John. (1988) Review: The Value of a Fixed Methodology. The British Journal for the Philosophy of Science 39, 263-275.
  5. ^  Laudan, Larry. (1989) If It Ain't Broke, Don't Fix It. The British Journal for the Philosophy of Science 40, 369-375.
  6. ^  Worrall, John. (1989) Fix It and Be Damned: A Reply to Laudan. The British Journal for the Philosophy of Science 40, 376-388.