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Nguyễn Phước Vĩnh Bang — known internationally as Vinh-Bang — was born in 1922 in Vietnam, then part of French Indochina, and arrived in Geneva in 1948, where he would spend the rest of his professional life as one of the most trusted and productive members of Jean Piaget's research circle. Alongside Bärbel Inhelder, he became one of just two Geneva-based psychologists on whom Piaget could rely across several consecutive decades of investigation — a distinction that speaks to both the depth of his intellectual formation and the rare combination of experimental precision and theoretical sensitivity he brought to the group. He took over the direction of the experimental psychology laboratory from Lambercier at the University of Geneva, transforming it into a site for the rigorous empirical testing of Piagetian hypotheses about children's cognitive development. He was a regular and central participant in the work of the International Centre for Genetic Epistemology, which Piaget founded in 1955 with the support of the Rockefeller Foundation and which brought together researchers from across the disciplines — logicians, mathematicians, biologists, linguists, and psychologists — to investigate the developmental origins of knowledge. Vinh-Bang contributed as a co-author to more than five volumes of the Centre's landmark series Études d'épistémologie génétique (Studies in Genetic Epistemology), published by Presses Universitaires de France, and he became closely identified with a concern for the pedagogical and educational applications of genetic psychology that distinguished his outlook within the Geneva school. On the occasion of his retirement in 1988, his assistants and collaborators at the University of Geneva produced a volume of Textes choisis (Selected Texts) in his honour, attesting to the scope and intellectual density of his scholarly output. He died in 2008, leaving a legacy that bridges the experimental science of Piagetian cognitive development and the practical world of educational assessment and classroom practice.

When Vinh-Bang took over the experimental psychology laboratory from Lambercier, he inherited a tradition of careful empirical investigation and extended it in new directions, bringing what observers described as great precision and intellectual subtlety to the design and conduct of new experiments on visual perception. His approach to experimentation was characterised by a double interest — in the methodological rigour of the experimental procedure itself and in the practical and pedagogical implications of what the experiments revealed about children's developing minds. This dual orientation kept the Geneva laboratory connected to the real world of educational practice in ways that purely theoretical or purely technical researchers might have failed to sustain. His stewardship of the laboratory ensured that the empirical arm of the Piagetian enterprise remained both scientifically credible and educationally relevant across three decades of research.

• Vinh-Bang. (1966). La méthode clinique et la recherche en psychologie de l'enfant. In F. Bresson & M. de Montmollin (Eds.), Psychologie et épistémologie génétiques (pp. 67–81). Dunod.

One of Vinh-Bang's most distinctive theoretical contributions concerned the methodology of developmental psychological research. He sought to supplement and enrich the celebrated clinical-critical method developed by Piaget and Inhelder — the flexible, hypothesis-driven conversational interview that became the hallmark of the Geneva approach — with new mathematical methods of hierarchical analysis of children's behaviours. The clinical-critical method had the virtue of flexibility and responsiveness to the individual child's reasoning but was sometimes criticised for its resistance to quantitative systematisation. Vinh-Bang's interest in hierarchical scaling methods offered a way to preserve the developmental sensitivity of Piagetian observation while enabling more rigorous statistical description of the sequence and structure of cognitive acquisitions. This methodological contribution positioned him as a bridge between the qualitative tradition of the Geneva school and the quantitative demands of empirical educational science, and it influenced the subsequent development of Piagetian assessment instruments.

• Vinh-Bang. (1966). La méthode clinique et la recherche en psychologie de l'enfant. In F. Bresson & M. de Montmollin (Eds.), Psychologie et épistémologie génétiques (pp. 67–81). Dunod.
• Vinh-Bang & Lunzer, E. (1965). Conservations spatiales. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. XIX). Presses Universitaires de France.

Among Vinh-Bang's most practically influential innovations was the development of a portable set of experimental materials — known informally as the valise Vinh-Bang (the Vinh-Bang suitcase) — which was used to conduct Piagetian developmental assessments in primary schools in Geneva during the 1960s. The suitcase contained standardised sets of objects, materials, and protocols drawn directly from the experimental paradigms that Piaget and his collaborators had developed in the laboratory, configured so that they could be administered by trained practitioners in ordinary classroom and school settings outside the university. Around ten sets of two suitcases were produced and put into use, creating one of the earliest systematic attempts to translate the experimental findings of genetic psychology into a practical educational diagnostic instrument. The valise represented a philosophy of educational research that Vinh-Bang consistently championed: that the science of cognitive development must ultimately speak to the work of teachers and schools, and that the gap between laboratory and classroom is not a natural divide but a practical challenge to be overcome by thoughtful instrument design and careful professional training.

Vinh-Bang's sustained contribution to the Études d'épistémologie génétique — the multi-volume research series edited by Piaget that constitutes one of the most ambitious programmes in the history of cognitive science — marks him as a core member of the Geneva intellectual enterprise rather than a peripheral contributor. Over two decades he appeared as a co-author on volumes addressing the learning of logical structures, the epistemology of space, spatial conservations, the epistemology and psychology of functions, the epistemology and psychology of identity, and the composition of forces. This range of collaborations reveals a researcher of unusual theoretical breadth, equally at home in discussions of formal logic and mathematical epistemology, spatial reasoning, functional relationships, and physical causality. The volumes bearing his name were translated into English and read by developmental psychologists worldwide, ensuring that his empirical and methodological contributions circulated far beyond the Francophone academic world in which they were produced.

• Morf, A., Smedslund, J., Vinh-Bang, & Wohlwill, J. F. (1959). L'apprentissage des structures logiques. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. IX). Presses Universitaires de France.
• Vinh-Bang & Lunzer, E. (1965). Conservations spatiales. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. XIX). Presses Universitaires de France.
• Piaget, J., Grize, J.-B., Szeminska, A., & Vinh-Bang. (1968). Épistémologie et psychologie de la fonction. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. XXIII). Presses Universitaires de France.
• Piaget, J., Sinclair, H., & Vinh-Bang. (1968). Épistémologie et psychologie de l'identité. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. XXIV). Presses Universitaires de France.

What united all of Vinh-Bang's scholarly preoccupations — experimental precision, methodological rigour, school-based assessment, and the pedagogical implications of developmental research — was a conviction that the theory of cognitive development had indispensable practical consequences for the design of educational experiences and curriculum. His Textes choisis (1988), compiled on the occasion of his retirement, was described by those who assembled it as revealing the subtlety with which he had continuously reflected on the relationship between educational psychology, didactics, and genetic epistemology. This bridging role — translating between the abstract theoretical vocabulary of the Geneva school and the concrete practical vocabulary of teachers, curriculum designers, and educational researchers — was both the signature of his intellectual vocation and his most durable educational legacy. Through his work and his person, Vinh-Bang also served as a living connection between the Vietnamese intellectual world, from which he had come in 1948, and the most advanced centre of cognitive developmental science in the mid-twentieth century, and his influence has been recognised in Vietnamese educational psychology scholarship as a foundational channel through which Piagetian concepts entered and informed Vietnamese educational thought.

• Vinh-Bang. (1988). Textes choisis. University of Geneva. [Published on the occasion of his retirement, edited by his assistants and collaborators]

• Vinh-Bang. (1966). La méthode clinique et la recherche en psychologie de l'enfant. In F. Bresson & M. de Montmollin (Eds.), Psychologie et épistémologie génétiques (pp. 67–81). Dunod.
• Morf, A., Smedslund, J., Vinh-Bang, & Wohlwill, J. F. (1959). L'apprentissage des structures logiques. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. IX). Presses Universitaires de France.
• Gréco, P., Grize, J.-B., Hatwell, Y., Piaget, J., Seagrim, G. N., Vurpillot, E., & Vinh-Bang. (1964). L'épistémologie de l'espace. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. XVIII). Presses Universitaires de France.
• Vinh-Bang & Lunzer, E. (1965). Conservations spatiales. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. XIX). Presses Universitaires de France.
• Piaget, J., Grize, J.-B., Szeminska, A., & Vinh-Bang. (1968). Épistémologie et psychologie de la fonction. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. XXIII). Presses Universitaires de France.
• Piaget, J., Sinclair, H., & Vinh-Bang. (1968). Épistémologie et psychologie de l'identité. In J. Piaget (Ed.), Études d'épistémologie génétique (Vol. XXIV). Presses Universitaires de France.
• Vinh-Bang. (1988). Textes choisis. University of Geneva.