Se establece un diálogo hermenéutico entre las concurrencias y bifurcaciones del idealismo simbólico de Cassirer y el racionalismo alado de Bachelard en tres momentos. Primero, a partir de indicios bio-bibliográficos se construye el contexto de significación vital donde se anclan sus respectivas ideas; segundo, se establecen entre ellos paralelismos fundamentales, y, tercero, se ofrecen ejemplos de la terminología bachelardiana, cercana a la hermenéutica simbólica contemporánea. Con ello se expande la comprensión de los análisis de Cassirer acerca del pensamiento indirecto e (...) interpretativo hacia las relaciones del hombre y la cultura, así como al papel del símbolo en el tránsito de la naturaleza a la cultura. The article establishes a hermeneutical dialogue between the convergences and divergences of Cassirer's symbolic idealism and Bachelard's winged rationalism. First, on the basis of bio-bibliographical evidence, it reconstructs the context of vital signification in which the authors' respective ideas are rooted; secondly, it identifies the fundamental parallelisms between them; and, finally, it provides examples of Bachelardian terminology that resembles that of contemporary symbolic hermeneutics. This results in a broader understanding Cassirer's analyses of indirect and interpretive thought regarding the relations between man and culture, as well as of the role of the symbol in the shift form nature to culture. (shrink)

This essay argues a case for viewing Derrida's work in the context of recent French epistemology and philosophy of science; more specifically, the critical‐rationalist approach exemplified by thinkers such as Bachelard and Canguilhem. I trace this line of descent principally through Derrida's essay ‘White Mythology: Metaphor in the Text of Philosophy’. My conclusions are (1) that we get Derrida wrong if we read him as a fargone antirealist for whom there is nothing ‘outside the text'; (2) that he provides some (...) powerful counter‐arguments to this and other items of current postmodern wisdom; (3) that deconstruction is more aptly viewed as continuing the epistemo‐critical approach developed by thinkers like Bachelard; and (4) that it also holds important lessons for philosophy of science in the mainstream Anglo‐ American ‘analytic’ tradition. (shrink)

The aim of this article is to show that what Gaston Bachelard called the “psychology of the imagination” often doubles as moral psychology. In Water and Dreams, for example, Bachelard presents “water’s morality,” which is a morality attained by an imagination of water’s purity. Similarly, in Air and Dreams, he explores the aerial imagination that forms the moral thought in Thus Spoke Zarathustra and calls the will to dynamism in Nietzschean philosophy “an experimental physics of moral life.” In Earth and (...) Reveries of Will, numerous terrestrial images are considered and the moralities they embody are discussed—among them the supreme hardness of the oak tree in Virginia Woolf’s Orlando and the “counsel of solidity” it gives. As Bachelard becomes more inclined to call his endeavor a “phenomenology of the imagination,” concern for morality becomes less pronounced. And yet in two of his later works, The Poetics of Space and The Poetics of Reverie, Bachelard continues to delve into the ways imagination allies with moral life. Sensitively heeding the solicitations from the material world and our responses to them, Bachelard’s psychology of the imagination is a project of self-knowledge of an unusual sort: it uncovers “the autobiography of lost possibilities” and revives confidence in human strength. Finally, a comparison between Bachelard’s moral psychology with the work of Theodor Adorno and of John McDowell shows that its philosophical significance is best viewed as a re-enchantment project—the re-enchantment of nature and our relationship with it. (shrink)

Massimiliano Simons provides the first systematic study of Serres' work in the context of late 20th-century French philosophy of science. By proposing new readings of Serres' philosophy, Simons creates a synthesis between his predecessors, Gaston Bachelard, Georges Canguilhem, and Louis Althusser as well as contemporary Francophone philosophers of science such as Bruno Latour and Isabelle Stengers. Simons situates Serres' unique contribution through his notion of the quasi-object, a concept, he argues, organizes great parts of Serres' work into a promising philosophy (...) of science as well as a challenge to the narrower field of French epistemology, to which it has often been limited. Simons highlights how the concept encompasses Serres' commitment to positive relations between science and culture and his rejection of pleas to purify the scientific self from imaginative and cultural elements. It helps to situate Serres between the distinct traditions of Bachelard and Latour as well as progressing the innovative aspects of Serres' philosophy for current debates in the philosophy, history, and sociology of science. Showing how Serres' philosophy can serve as a normative approach to science and technology, Michel Serres and French Philosophy of Science takes in themes of materiality, religiosity, modernity and ecology to advance a timely alternative to philosophy of science for contemporary life. (shrink)

In 1968, Jürgen Habermas claimed that, in an advanced technological society, the emancipatory force of knowledge can only be regained by actively recovering the ‘forgotten experience of reflection’. In this article, we argue that, in the contemporary situation, critical reflection requires a deliberative ambiance, a process of mutual learning, a consciously organised process of deliberative and distributed reflection. And this especially applies, we argue, to critical reflection concerning a specific subset of technologies which are actually oriented towards optimising human cognition. (...) In order to create a deliberative ambiance, fostering critical upstream reflection on emerging technologies, we developed the concept of a mutual learning exercise. Building on a number of case studies, we analyse what an MLE involves, both practically and conceptually, focussing on key aspects such as ambiance and expertise, the role of ‘genres of the imagination’ and the profiles of various ‘subcultures of debate’. Ideally, an MLE becomes a contemporary version of the Socratic agora, providing a stage where multiple and sometimes unexpected voices and perspectives mutually challenge each other, in order to strength-en the societal robustness and responsiveness of emerg-ing technologies. (shrink)

Gaston Bachelard occupies a unique position in the history of European thinking. As a philosopher of science, he developed a profound interest in genres of the imagination, notably poetry and novels. While emphatically acknowledging the strength, precision and reliability of scientific knowledge compared to every-day experience, he saw literary phantasies as important supplementary sources of insight. Although he significantly influenced authors such as Lacan, Althusser, Foucault and others, while some of his key concepts are still widely used, his oeuvre tends (...) to be overlooked. And yet, as I will argue, Bachelard’s extended series of books opens up an intriguing perspective on contemporary science. First, I will point to a remarkable duality that runs through Bachelard’s oeuvre. His philosophy of science consists of two sub-oeuvres: a psychoanalysis of technoscience, complemented by a poetics of elementary imagination. I will point out how these two branches deal with complementary themes: technoscientific artefacts and literary fictions, two realms of human experience separated by an epistemological rupture. Whereas Bachelard’s work initially entails a panegyric in praise of scientific practice, he becomes increasingly intrigued by the imaginary and its basic images, such as the Mother Earth archetype. (shrink)

In this essay, I show how the French philosopher of science, Gaston Bachelard, reacted to the idea of phenomenology at different stages of his philosophical development. During the early years, Kantianism (through a Schopenhauerian reading of Kant) had the greatest influence on his understanding of phenomenology. Even if he always considered phenomenology a valuable method, Bachelard believed that the term noumenon is necessary, not for a full description of reality, but for probing possible sources of reality. For him, phenomena are (...) not only static objects or things observed in nature, but dynamic objects that can be produced or even created (hence phenomenotechnique). The noumenal realm lies beyond the structure of the phenomenal world. In his later “poetical” years, Bachelard did not make a strict distinction between noumena and phenomena, but instead situated the poetical (literary) image, a phenomenon of literary consciousness, in specific zones between subjectivity and objectivity; the term phenomenotechnique no longer plays any role in his study of imagination or daydreams. For the later Bachelard, phenomenology became the method or attitude that can best lead us into the unexplored regions of our consciousness (reverie) which remain largely forgotten by Western philosophy, or drowned out by its exclusive concern with other aspects of consciousness, such as rational thought. (shrink)

Ian Hacking’s Representing and Intervening is often credited as being one of the first works to focus on the role of experimentation in philosophy of science, catalyzing a movement which is sometimes called the “philosophy of experiment” or “new experimentalism”. In the 1980s, a number of other movements and scholars also began focusing on the role of experimentation and instruments in science. Philosophical study of experimentation has thus seemed to be an invention of the 1980s whose central figure is Hacking. (...) This article aims to assess this historical claim, made by Hacking himself as well as others. It does so first by highlighting how a broader perspective on the history of philosophy reveals this invention narrative to be incorrect, since experimentation was a topic of interest for earlier philosophers. Secondly, the article evaluates a revision of this historical claim also made by some philosophers of experiment: the rediscovery narrative, which frames Hacking and others as having rediscovered the work of these earlier authors. This second narratives faces problems as well. Therefore we develop a third narrative which we call the contextualist narrative. Rather than considering experimentation in an essentialist manner as a fixed research object that is either present or not in the work of specific authors, experimentation should be addressed through a narrative that asks in what way it becomes a philosophical problem for certain authors and for what purpose. Such contextualization enables a repositioning of Hacking’s philosophy of experiment in relation to the specific debates in which he intervened, such as the realism-antirealism debate, the Science Wars and the debate on incommensurability. (shrink)

The work of Gaston Bachelard is known for two crucial concepts, that of the epistemological rupture and that of phenomenotechnique. A crucial question is, however, how these two concepts relate to one another. Are they in fact essentially connected or must they be seen as two separate elements of Bachelard’s thinking? This paper aims to analyse the relation between these two Bachelardian moments and the significance of the concept of phenomenotechnique for today. This will be done by examining how the (...) concepts of Bachelard have been used from the 1960s on. From this historical perspective, one gets the impression that these two concepts are relatively independent from each other. The Althusserian school has exclusively focused on the concept of ‘epistemological break’, while scholars from Science & Technology Studies, such as Bruno Latour, seem to have only taken up the concept of phenomenotechnique. It in fact leads to two different models of how to think about science, namely the model of purification and the model of proliferation. The former starts from the idea that sciences are rational to the extent that they are purified and free from obstacles. Scientific objectivity, within this later model, is not achieved by eradicating all intermediaries, obstacles and distortions, but rather exactly by introducing as many relevant technical mediators as possible. Finally, such a strong distinction will be criticized and the argument will be made that both in Bachelard’s and Latour's thought both concepts are combined. This leads to a janus-headed view on science, where both the element of purification and the element of proliferation are combined. (shrink)

This paper critically evaluates Foucault’s relation to Bachelard and Canguilhem. It reconsiders the relevance of the concept of “influence” for treating this relation in order to register the more sceptical position Foucault adopts towards knowledge practices than either of these figures from twentieth-century French epistemology.

For interdisciplinarity between physics and mathematics to take its proper place in secondary schools, its value must be demonstrated and used during the future teacher’s university education. We have observed from examples and surveys, however, that an ever-widening gulf is emerging between degree courses in mathematics and physics. This article therefore develops comparative approaches to some common concepts to demonstrate their complementarities from the angle of the relation between mechanics and analysis. The example of the differential, which is described as (...) an obstacle to the “mathematization” of physics, is used to transform it into a tool to aid conceptualization, offering a dual approach to the concepts and their applications. This should enable students to have a better understanding that is related to their specific curriculum. (shrink)

At the same time as a purported renewal of metaphysics is taking place in analytical philosophy, criticism of metaphysics has also increased. Criticism of metaphysics is usually made by naturalistic metaphysicians and is aimed at non-naturalistic metaphysics. Without endorsing any of the above schools, in this essay I undertake, not a criticism of metaphysics, but a criticism of the current criticism of metaphysics. I therefore review some of the most important issues at stake in this criticism, which merely recycles centuries-old (...) criticism of metaphysics in general: the alleged sterility and futility of metaphysics, its vagueness, the propensity for fantasy, the lack of imagination and foresight, its alleged dependence on intuition and, above all, its independence from experience. I conclude that all these criticisms supply an inaccurate image of metaphysics and a concomitant inaccurate image of science rooted in a refusal to recognize that a strict separation between a priori and a posteriori cannot be achieved. (shrink)

: The paper aims at an analysis of the oeuvre of the French historian of science and epistemologist Gaston Bachelard (1884–1962). Bachelard was the founder of a tradition of French thinking about science that extended from Jean Cavaillès over Georges Canguilhem to Michel Foucault. In the past, he has become best known and criticized for his postulation of an epistemological rupture between everyday experience and scientific experience. In my analysis, I emphasize another aspect of the work of Bachelard. It is (...) the way he conceptualizes the relation between scientific thinking and technology in modern science. Within this framework, the notion of "phenomenotechnique" is of crucial importance. It is one of the organizing concepts of Bachelard's historical epistemology, and it serves as the organizing center of this paper. (shrink)

The paper approaches the topic of what a general philosophy of science could mean today from the perspective of a historical epistemology. Consequently, in a first step, the paper looks at the notion of generality in the sciences, and how it evolved over time, on the example of the life sciences. In the second part of the paper, the urgency of a general philosophy of science is located in the history of philosophy of science. Two attempts at the beginning of (...) the twentieth century are particularly highlighted: that of Karl Popper and that of Martin Heidegger. Both of them concentrate, albeit in widely different form, on the phenomenon of research as an open-ended process. This trend is even more pronounced in Gaston Bachelard’s version of a historical epistemology, whose work is taken as a point of reference for a general historical epistemology of research. The paper concludes with a plea to look, with Georges Canguilhem, at the history of the sciences as a laboratory for epistemology. (shrink)

It is generally accepted that the development of the modern sciences is rooted in experiment. Yet for a long time, experimentation did not occupy a prominent role, neither in philosophy nor in history of science. With the ‘practical turn’ in studying the sciences and their history, this has begun to change. This paper is concerned with systems and cultures of experimentation and the consistencies that are generated within such systems and cultures. The first part of the paper exposes the forms (...) of historical and structural coherence that characterize the experimental exploration of epistemic objects. In the second part, a particular experimental culture in the life sciences is briefly described as an example. A survey will be given of what it means and what it takes to analyze biological functions in the test tube. (shrink)

Since the practice turn, the role technologies play in the production of scientific knowledge has become a prominent topic in science studies. Much existing scholarship, however, either limits technology to merely mechanical instrumentation or uses the term for a wide variety of items. This article argues that technologies in scientific practice can be understood as a result of past scientific knowledge becoming sedimented in materials, like model organisms, synthetic reagents or mechanical instruments, through the routine use of these materials in (...) subsequent research practice. The proposed theoretical interpretation of technology is examined through a case where a model organism—Drosophila melanogaster—acted as a technology for investigating a contested biological effect of a mechanical instrument: Hermann J. Muller’s experiments on X-ray mutagenicity in the 1920s. The article reconstructs how Muller employed two synthetic Drosophila stocks as tests for measuring X-rays’ capacity to cause genetic aberration. It argues that past scientific knowledge sedimented in the Drosophila stocks influenced Muller’s perception of X-ray-induced mutation. It further describes how Muller’s concept of X-ray mutagenicity sedimented through the adoption of X-ray machines as a ready-made resource for producing mutants by other geneticists, for instance George Beadle and Edward Tatum in their experiments on Neurospora crassa, despite ongoing disputes surrounding Muller’s conclusions. Technological sedimentation is proposed as a potential explanation why sedimentation and disputation may often coexist in the history of science. (shrink)

This paper deals with Ludwik Fleck’s theory of thought styles and Michael Polanyi’s theory of tacit knowledge. Though both concepts have been very influential for science studies in general, and both have been subject to numerous interpretations, their accounts have, somewhat surprisingly, hardly been comparatively analyzed. Both Fleck and Polanyi relied on the physiology and psychology of the senses in order to show that scientific knowledge follows less the path of logical principles than the path of accepting or rejecting specific (...) conventions, where these may be psychologically or sociologically grounded. It is my aim to show that similarities and differences between Fleck and Polanyi are to be seen in the specific historical and political context in which they worked. Both authors, I shall argue, emphasized the relevance of perception in close connection to their respective understanding of science, freedom, and democracy. (shrink)

The article shows the strategic analogies, but also the differences between Bachelard and Canguilhem on the use of the history of science for epistemology. It emphasizes the importance of the ideology for Canguilhem, and the conceptual essence he recognizes in the history of science, which is read in its internal specific differences and in its complex articulations with life and reality. No concept, in fact, comes from nothing. The link between history and epistemology is not however of subjection, but of (...) mutual influence. Canguilhem radicalizes the thought of Bachelard, and recognizes the historicity of every aspect of scientific knowledge, even of its less valued features and above all of errors. All aspects of Science are historical. The object of the history of science is not the object of the sciences, because it is always a discourse. This is why the history of science is inevitably linked to other forms of history. This opens up a pluralist conception of History and of Time, thinking of the sciences in their real body and no longer ideal or legal. Thus Canguilhem opens the way to the researches of Foucault and Serres. (shrink)

The notion of the ‘division of physiological labour’ is today an outdated relic in the history of science. This contrasts with the fate of another notion, which was so frequently paired with the division of physiological labour, which is the concept of ‘morphological differentiation.’ This is one of the elementary modal concepts of ontogenesis. In this paper, we intend to target the problems and causes that gradually led biologists to combine these two notions during the 19th century, and to progressively (...) dissociate them, retaining only the concept of differentiation by the early 20th century. We shall adhere to the following: 1. The primitive economic concept of the division of labour is not a descriptive notion denoting a type of organisation of labour, but an etiological one: the idea of a causal relationship between this type of organization and the improvement of the whole. 2. This concept rapidly interested naturalists such as Henri Milne-Edwards, who were keen to find a rational ground for hierarchizing living forms based on anatomical complexity. 3. The validation of this notion in the realms of biology was subject to at least two conditions which were far from being fully satisfied. This did not prevent, however, the initial success of the concept of the division of physiological labour during the second half of the 19th century. 4. Finally, the gradual disqualification, within the Darwinian theoretical context, of the conception of an intrinsic hierarchical rank of organisms, led to a lack of interest in the concept of the physiological division of labour, at least in its non-Darwinian and non-ecological variant (the link between the division of labour within an organism and organic perfection). (shrink)

The notion of the ‘division of physiological labour’ is today an outdated relic in the history of science. This contrasts with the fate of another notion, which was so frequently paired with the division of physiological labour, which is the concept of ‘morphological differentiation.’ This is one of the elementary modal concepts of ontogenesis. In this paper, we intend to target the problems and causes that gradually led biologists to combine these two notions during the 19th century, and to progressively (...) dissociate them, retaining only the concept of differentiation by the early 20th century. We shall adhere to the following: 1. The primitive economic concept of the division of labour is not a descriptive notion denoting a type of organisation of labour, but an etiological one: the idea of a causal relationship between this type of organization and the improvement of the whole. 2. This concept rapidly interested naturalists such as Henri Milne-Edwards, who were keen to find a rational ground for hierarchizing living forms based on anatomical complexity. 3. The validation of this notion in the realms of biology was subject to at least two conditions which were far from being fully satisfied. This did not prevent, however, the initial success of the concept of the division of physiological labour during the second half of the 19th century. 4. Finally, the gradual disqualification, within the Darwinian theoretical context, of the conception of an intrinsic hierarchical rank of organisms, led to a lack of interest in the concept of the physiological division of labour, at least in its non-Darwinian and non-ecological variant. (shrink)

In the late 1960s, Georges Canguilhem introduced the concept of ‘scientific ideology’. This concept had not played any role in his previous work, so why introduce it at all? This is the central question of my paper. Although it may seem a rather modest question, its answer in fact uncovers hidden tensions in the tradition of historical epistemology, in particular between its normative and descriptive aspects. The term ideology suggests the influence of Althusser’s and Foucault’s philosophies. However, I show the (...) differences between Canguilhem’s concept of scientific ideology and Althusser’s and Foucault’s respective concepts of ideology. I argue that Canguilhem was in fact attempting to solve long-standing problems in the tradition of historical epistemology, rather than following the lead of his younger colleagues. I argue that Canguilhem’s ‘refurbishment without rejection’ of Bachelard’s epistemology, which the concept of scientific ideology was aimed to implement, was necessary to justify the historical narratives that Canguilhem had constructed in his own work as a historian of concepts. A strict acceptance of Bachelard’s epistemology would have made it impossible to justify them. Canguilhem’s concept of scientific ideology therefore served as a theoretical justification of his practice as a historian. I maintain that the concept of scientific ideology was needed to reconcile Bachelard’s normative epistemology with Canguilhem’s view of the history of science and its aims, which differed from Bachelard’s more than it is generally acknowledged. (shrink)

This article provides an overview of the historical and philosophical context from which originated G. Bachelard's concept of "phenomenotechnique". It analyzes why phenomenotechnique is crucial for science studies. By incorporating the concept of phenomenotechnique into Hacking's and Galison's models of science, I argue that we can avoid the radicalism of both while also preventing the analysis of scientific practices from collapsing into the interpretive frames mandated by social constructivists.

Those who know the work of Karl Popper will have recognized in my title the transformation into interrogation of a formula repeated several times by this eminent philosopher of science, whom some consider as the greatest of the 20th century in his specific field - even if they do not share his theses. This Popperian formula, to which I wish to devote my analyzes here, has at least the merit of being clear and impactful. But as often, what is clear (...) and impactful can become too simple for what is to be thought, and perhaps even too simple to express faithfully the philosophy which one seeks to summarize there. Writing this, I am not claiming that Popper was not really a falsificationist. Far be it from me to dispute that the great thesis of his epistemology consists in making any scientific theory worthy of the name falsifiable or refutable. This is indisputable: for Popper, the dividing line between scientific theory and non-scientific theory lies precisely in this falsifiable character. (shrink)

The work of Michel Serres is often presented as a radical break with the work of Gaston Bachelard. The aim of this paper is to partly correct this image, by focusing on Serres’s early Hermes series (1969-1980). In these books Serres portrays himself as a follower of Bachelard, exemplarily shown in his neologism of the ‘new new scientific spirit’ (le nouveau nouvel esprit scientifique), updating Bachelard in the light of more recent scientific developments. This allows a reinterpretation of the relation (...) between both authors, one where there is room to acknowledge how the roots of Serres’s philosophy lie not in a radical break with Bachelard, but can be partly understood as a Bachelardian criticism of Bachelard himself. This Bachelardian criticism consists in what could be called his ‘surrationalism’: the sciences do not follow the categories imposed by philosophers, but are always more flexible and open than these categories allow. Specific critiques of Serres, such as those concerning the novelty of Bachelard’s thought, the role of epistemology and finally the political dimension of science will be evaluated through a reappraisal of this Bachelardian move that underlies Serres’s criticism. (shrink)

Este texto visa traçar, de modo breve, a noção de criação científica na obra deGaston Bachelard. Busco, assim, me centralizar em seus trabalhos epistemológicos.Procuro também mostrar como esta noção foi importante no trabalho do filósofo.

The collection Virtual Mathematics: the logic of difference brings together a range of new philosophical engagements with mathematics, using the work of French philosopher Gilles Deleuze as its focus. Deleuze’s engagements with mathematics rely upon the construction of alternative lineages in the history of mathematics in order to reconfigure particular philosophical problems and to develop new concepts. These alternative conceptual histories also challenge some of the self-imposed limits of the discipline of mathematics, and suggest the possibility of forging new connections (...) between philosophy and more recent developments in mathematics. This component of Deleuze’s work has, to date, been rather neglected by commentators working in the field of Deleuze studies. One of the aims of this collection is to address this critical deficit by providing a philosophical presentation of Deleuze’s relation to mathematics; one that is adequate to his project of constructing a philosophy of difference and to the exploration of some of its applications. This project developed as a result of encounters with an increasing number of researchers who have been working on the mathematical aspects of Deleuze’s work and the key role that these play in his philosophy. By bringing this work together for the first time, this collection makes an important contribution to the emerging body of work that endeavours to explore the broad range of Deleuze’s philosophy. (shrink)

The aim of this chapter is to show how Francophone PS, or what is called French (historical) epistemology, embodies this interconnectedness. Moreover, a novel approach to what constitutes French epistemology will be developed here, going beyond a purely historical survey or a reevaluation of a range of concepts found in this tradition.7 The aim is instead to highlight two methodological principles at work in French epistemology that are often in tension with one another, but are not recognized as such in (...) the literature. (shrink)

Dans un nombre croissant de domaines scientifiques - sciences de la nature, sciences humaines aussi bien que sciences des artefacts -, la simulation ne joue plus le rôle de succédané temporaire d'une théorie encore en gésine parce que non encore élaborée ; c'est-à-dire qu'elle ne joue plus systématiquement le rôle d'un modèle provisoire ou d'un schéma servant à condenser les mesures. C'est qu'elle n'a pas la nature d'un signe graphique, linguistique ou mathématique. Elle joue au contraire de plus en plus (...) le rôle d'une réplication détaillée du réel : elle est une intuition reconstruite avec justesse mais sans abstraction rationnelle et généralisante, donc sans transfiguration iconique. Une des limites de l'épistémologie dialectique de Bachelard tient à ce qu'elle ne donne pas les concepts pour penser assez distinctement ces pratiques contemporaines de simulation. C'est pourquoi l'A. propose de concevoir l'idée que la science contemporaine se développe non plus selon la seule dialectique matérialisme / rationalisme, mais selon la triade rationalisme/computationalisme/matérialisme. (shrink)

The credibility of digital computer simulations has always been a problem. Today, through the debate on verification and validation, it has become a key issue. I will review the existing theses on that question. I will show that, due to the role of epistemological beliefs in science, no general agreement can be found on this matter. Hence, the complexity of the construction of sciences must be acknowledged. I illustrate these claims with a recent historical example. Finally I temperate this diversity (...) by insisting on recent trends in environmental sciences and in industrial sciences. (shrink)