In this blog post, we will examine the concepts and differences between inductivism and falsificationism, their respective limitations, and the significance of these two approaches in the development of science.

The Emergence of Inductivism and Falsificationism

Scientific theories are formed based on empirical facts obtained through observation and experimentation. Consequently, the idea that science must, above all, be objective and undergo rigorous verification has long been accepted as a key premise in the philosophy of science. This perspective was gradually established during the development of modern science, as exemplified by Galileo and Newton. During this period, science began to establish itself as a discipline independent of religion and philosophy.
Prior to this, science had been under the strong influence of religion, making it difficult for research findings or observations that contradicted religious dogma to gain widespread acceptance. However, as modern science developed, it secured considerable independence from religion, and numerous theories emerged that could effectively explain various natural phenomena. The observations and experiments supporting these theories were largely based on inductive methods.
The inductive approach made a tremendous contribution to the advancement of science. However, as cases gradually came to light where scientific theories derived inductively failed to adequately explain actual phenomena, the limitations of inductivism also began to surface. Consequently, scholars supporting falsificationism pointed out various problems with inductively formed scientific theories, and two representative approaches—inductivism and falsificationism—were established as methods for understanding and researching science.

Characteristics and Limitations of Inductivism

Inductivism is an approach that involves observing specific phenomena and deriving general theories based on the results of those observations. Simply put, it is a method of gradually strengthening hypotheses or theories by accumulating explanations for various phenomena. The more consistently a theory explains a wide range of phenomena, the more credibility it gains.
However, this inductivist approach has a significant limitation. No matter how many cases a theory explains, if it fails to account for even a single phenomenon, that theory faces a serious problem. Inductivists seeking to uphold their theory attempt to modify the existing theory to explain such exceptional phenomena.
The concept that emerges in this process is “ad hoc modification.” Ad hoc modification refers to the attempt to explain a new phenomenon by adding a stopgap assumption or partially altering the existing theory. However, this approach faces significant criticism from falsificationists.
This weakness of inductivism is a major target of criticism by falsificationists. Falsificationism regards the extent to which a theory is susceptible to falsification as a crucial criterion. Therefore, it is viewed as having limitations in that an inductively derived theory will easily collapse the moment it cannot avoid falsification.

Characteristics and Limitations of Falsificationism

Falsificationism is an approach to advancing science through constant attempts to falsify theories that explain specific phenomena. As explained earlier, falsificationism regards a theory’s susceptibility to falsification as a key criterion. In other words, the greater the potential for falsification, the more a theory is evaluated as being universally valid.
For example, let’s assume there are two theories: “The hair of men living in South Korea is black” and “The hair of men living in Seoul is black.” If the first theory is true, then the second theory is also true. However, just because the second theory is true does not necessarily mean that the first theory is true as well. Looking at the inclusion relationship between the two theories, since the second theory is included in the first, the first theory can be said to be a more general theory that explains a wider range of phenomena.
If one were to attempt to falsify these two theories, the more general first theory would be the one more likely to be falsified. In other words, the more general a theory is, the greater its potential for falsification.
Furthermore, in falsificationism, a theory is considered more reliable the more it withstands various attempts at falsification. This is a perspective quite different from that of inductivism. While inductivism places importance on how many phenomena a theory explains, falsificationism places importance on how many attempts at falsification it has withstood.
Falsificationism differs from inductivism in that it always keeps the possibility of falsification in mind when a theory explains phenomena. Inductivism tends to rate a theory’s reliability highly simply because no cases contradicting the theory have been found so far. However, the mere fact that no counterexamples have been found to date does not allow us to conclude that the theory is absolutely true, as there is always the possibility that new counterexamples may emerge.
Falsificationism, on the other hand, actively embraces this uncertainty because it seeks to test theories based on the premise of falsifiability from the outset. However, falsificationism also has its limitations. When attempting to falsify a theory, one presents an observational proposition regarding a specific phenomenon and determines whether it contradicts the theory. Yet, there is no guarantee that this observational proposition itself is always accurate.
In other words, since observational propositions are also formed within a specific theoretical framework, if the observation used for falsification is itself incorrect, the falsification loses its validity. Ultimately, observations depend on yet another theory, and that theory, in turn, becomes the subject of verification. In this respect, falsificationism faces a kind of circular problem. Just like a Möbius strip, the observational proposition put forward to falsify a theory must itself be supported by yet another theory. Therefore, completely and definitively falsifying a scientific theory is not easy in practice, and this is pointed out as a major limitation of falsificationism.

The Difference Between Two Perspectives on Confirmation

The difference between inductivism and falsificationism is also evident in their approaches to confirmation. Inductivism holds that the confirmation of a theory is determined by the logical relationship between a confirmed observational proposition and the theory that the observation supports. In other words, it posits that as the number of instances supporting a theory increases, so does the theory’s reliability.
However, this inductivist concept of confirmation has limitations when viewed from the perspective of the historical development of science. This is because numerous observations that agree with a theory merely increase confidence in the existing theory but do not lead to new scientific advancements.
In contrast, falsificationism understands confirmation within a historical context. If a theory passes rigorous falsification tests and successfully predicts or explains new phenomena that were previously difficult to explain, that theory is held in higher regard. In other words, it is believed that science truly advances only when a new theory explains a phenomenon that was difficult to predict using the dominant theory of the time.
For example, simply dropping a stone to confirm that the result matches what Newtonian mechanics predicted merely increases confidence in the existing theory. However, if a new phenomenon that cannot be explained by the existing theory is discovered, and a better theory is proposed as a result, that leads to scientific progress.
A look at the history of physics clearly illustrates this process. Following Aristotle’s natural philosophy, Newtonian mechanics emerged, and later, Einstein’s theory of relativity was proposed to explain phenomena that were difficult to account for using Newtonian mechanics. This process demonstrates that science has advanced through a cycle of criticism of existing theories and the introduction of new explanations.

The History of Science That Fails to Be Explained by Falsificationism

However, the history of science poses challenges even for falsificationism. A prime example is Newton’s theory of gravity. Immediately after its publication, Newton’s theory of gravity was criticized for not aligning with certain observational results regarding the Moon’s orbit. However, as research continued, it became clear that the cause of the problem lay not in Newton’s theory of gravity itself but in other factors.
Bohr’s atomic model also had aspects that did not fully align with various observational results of the time, yet it was not immediately discarded. According to the logic of falsificationism, a theory for which clear falsification has been demonstrated should be replaced by a superior theory. However, the actual history of science has not unfolded so simply.
Even today, Newtonian mechanics is used as a highly accurate theory under certain conditions, and Bohr’s atomic model also plays an important role in educational curricula for understanding atomic structure. The emergence of a new theory does not mean that the existing theory disappears completely; in many cases, it remains valid depending on its scope of application.
Theories that incorporate new concepts may initially encounter various instances of falsification, but it is not uncommon for them to continue to evolve as the theory is refined and related research accumulates. These historical examples demonstrate that the development of scientific theories involves a process far more complex than that described by falsificationism.
On the other hand, inductivism also fails to fully explain the actual process of scientific development, as it focuses on accumulating evidence supporting a theory without considering the historical context. Therefore, while both inductivism and falsificationism provide important perspectives for understanding the development of science, each has its own inherent limitations.

A Perspective That Considers Inductivism and Falsificationism Together

So far, we have examined the concepts of inductivism and falsificationism, as well as their respective limitations, in the context of the history of science. Science plays a vital role in explaining the world we live in, and it is difficult to deny that both the inductive and falsificationist approaches have had a significant impact on the development of science. Furthermore, when understanding science as a method for explaining the real world, it is clear that there is not just a single approach but rather a coexistence of diverse perspectives. Inductivism and falsificationism are representative approaches that occupy a very important position in this context.
As discussed earlier, inductivism focuses on accumulating evidence supporting a theory, regardless of historical context. Therefore, it has certain limitations when it comes to explaining the overall process of scientific development. Nevertheless, the inductive approach is an indispensable method in the process of forming new theories. This is because, to explain a new phenomenon, one must first collect information through various observations and then formulate hypotheses and theories based on that information.
Conversely, once a certain amount of information has been accumulated and a theory has been formed, it must undergo various attempts at falsification to make it more robust. A theory that withstands multiple attempts at falsification can establish itself as a more reliable theory; conversely, if it fails to overcome falsification, the theory reveals its limitations. And if a new theory emerges to explain those limitations, this directly leads to the advancement of science. This process can be confirmed through various examples in the history of science.
Therefore, to develop theories that explain the real world, it is more desirable to utilize both inductivism and falsificationism together rather than insisting on just one of them. This is because more robust scientific theories can be created when the process of formulating theories through observation and verifying them through falsification is repeated.
This trend can also be observed in the history of physics. Beginning with Aristotle’s natural philosophy in ancient times, Newtonian mechanics emerged, and later, Einstein’s theory of relativity was proposed to explain phenomena that were difficult to account for using Newtonian mechanics. Of course, while Aristotle’s natural philosophy is not accepted as a modern scientific theory today, it is still recognized as an important starting point in the development of the history of science. Furthermore, even after the advent of the theory of relativity, Newtonian mechanics continues to be applied with a very high degree of accuracy at everyday speeds and scales; the theory of relativity is understood not as a complete rejection of Newtonian mechanics, but rather as a theory that expands its scope of application.
However, the theory of relativity does not perfectly explain all phenomena either. Challenges such as unifying gravity and quantum mechanics into a single theory remain, and various studies are underway to resolve them. Therefore, there is a strong possibility that new scientific theories will emerge in the future to supplement or expand upon current theories. In science, the process of continuously developing theories that explain reality more accurately is more important than having an absolutely perfect theory.
Even in the process of developing new scientific theories in the future, relying solely on an inductive approach may have its limitations. In modern science, where a vast body of observations and experiments has already been accumulated, the falsificationist approach—which actively examines phenomena that existing theories cannot explain and seeks to propose new theories to account for them—also plays a crucial role.

A Desirable Approach for Scientific Progress

Looking at the history of scientific development, it is true that the falsificationist approach has historically played a key role in driving the emergence of new theories and the growth of science. However, it is also necessary to acknowledge, to some extent, the theory-dependence of observational propositions raised by falsificationism. This is because if the observations used for falsification themselves depend on yet another theory, the problem arises of having to endlessly verify the validity of those observations.
For example, consider the hypothesis that all objects reach the ground at the same time when dropped from the same height. In reality, this result does not always hold true because objects are subject to air resistance in the atmosphere. While this can be presented as a case of falsification, the discussion would inevitably continue indefinitely if we were required to prove the concept of air resistance itself and, furthermore, to continually verify even the fact that objects fall downward.
In other words, if we attempt to continually verify every premise contained in the observational propositions used for falsification, science is likely to return to its starting point rather than move forward. Many scientific theories widely accepted today are the result of numerous experiments and verifications. Therefore, observations and falsifications based on these theories must be accepted on the premise of a certain level of reliability.
Ultimately, for a new scientific theory to emerge, a balanced approach is necessary: one that actively pursues falsification while maintaining a reasonable level of trust in the observations and existing theories that form the basis for falsification. It is preferable to understand inductivism and falsificationism not as opposing concepts, but as complementary approaches that have jointly driven the advancement of science.