He actively participated in many national and international congresses and seminars, between 1967 and 1985. We mention as the most significant those of : Palma de Mallorca, Geneva, Rotterdam,Vienna, Paris, Amsterdam and Fontainebleau, among others.

• Seminar, conducted jointly with Professor A. Kaufmann, on: «La Teoría de los subconjuntos borrosos aplicada a la gestión de las empresas, en un futuro incierto». «The theory of fuzzy sub-sets applied to business management in an uncertain future». Santiago de Compostela University, Faculty of Economic Science. October 7, 8 and 9, 1986.
• Seminar, conducted jointly with Porfessor A. Kaufmann, on: «Técnicas para reducir la incertidumbre en las decisiones de la empresa». «Techniques for reducing uncertainty in business decisions». Faculty of Economic Science,  Málaga University. December 2 and 3, 1986.
• Seminar, conducted jointly with Professor A.Kaufmann, on: «Cómo dominar la incertidumbre en las decisiones de las empresas». «How to dominate uncertainty in business decisions». Business Administration School of Barcelona. February 9 and 10, 1987.
• Seminar, conducted jointly with Professor A. Kaufmann, on: «Técnicas Operativas de Gestión para el tratamiento de la incertidumbre!. «Operating techniques for treating uncertainty». Faculty of Economic Science of the Barcelona University. June 1 and 2, 1987.
• Participation in the II Basque World Congress speaking on: La distribución geográfica empresarial en un espacio plurinacional». «Geographical distribution of business in a pluri-national space». October 6, 1987.
• Centenary of the Zaragoza School of Commerce. Speaking on: «La investigación operativa en el ámbito de la empresa. Perspectivas actuales y futuras». «Operational research in the business sphere. Current and future perspectives». November 13, 1987.
• Doctoral Course on: «Teoría de los Subconjuntos borrosos y la Empresa». «Theory of fuzzy sub-sets and the company». Faculty of Economic and Business Science at the Valencia University. January 14 and 15, 1988.
• Seminar, conducted jointly with Professor A. Kaufmann, on: «Nuevas Direcciones en el tratamiento de los problemas de gestión». «New directions in the treatment of management problems». Faculty of Economic and Business Science of the Barcelona University. January 27 and 28, 1988
• V Economic Convention. «Técnicas Operativas de Gestión Empresarial: Nuevas Aportaciones para el tratamiento de la Incertidumbre». «Operating techniques for business management. New contributions for the treatment of uncertainty». Faculty of Economic and Business science, Santiago de Compostela University. March 10 and 11, 1988.
• II AEDEM Congress (Spanish Association of Business Economy), speaking on: «El Riesgo y la incertidumbre en el momento actual». «Risk and uncertainty at this time». Las Palmas de Gran Canaria. May 11, 12 and 13, 1988. (Published).
• Seminar conducted on: «Financiación de las Empresas en un ambiente incierto». «Business Financing in an environment of uncertainty». Vigo School of Business. September 12 and 13, 1988.
• IV Convention of Management Leadership. Speaking on: «Situación y Perspectivas económico-financieras frente al reto de 1992» «Economic and financial situation and perspectives faced with the challenge of 1992». Alicante, October 20, 1988.
• Seminar, conducted jointly with Professor A. Kaufmann, on: «Nuevos métodos para la solución de los problemas de gestión en la incertidumbre». «New methods for resolving management problems in uncertainty». November 23 and 24, 1988.
• Course on Business Management organised by Jordi Morera Jansa, S.A. Seminar on: Dirección Financiera: Técnicas actuales y futuras». «Financial Management: Current and future techniques». Alicante March 3 and April 13, 1989.
• Doctoral course at the Faculty of Economic and Business Science of the Valencia University. March 9 and 10, 1989.
• VII Seminar-Convention on Management Leadership and Sales-Marketing, organised by Jordi Morera Jansa, S.A. Speaking on: «La creatividad a través del STIM-5». «Creativity by means of STIM-5». Alicante, October 7 and 8, 1989.
• Seminar, conducted jointly with Professor A. Kaufmann, on: «Nuevas Técnicas de Gestión de Empresas para el futuro incierto». «New Business Management techniques for an uncertain future». Faculty of Economic Science. Barcelona, December 12 and 13, 1989.
• Doctoral course. Seminar at the Faculty of Economic and Business Sciences of the Valencia University, on «Gestión en la Incertidumbre: Técnicas y Aplicaciones de la Teoría de los Subconjuntos Borrosos» (Management in Uncertainty: Techniques and Application of the Theory of Fuzzy Subsets). Valencia, February 6 and 7, 1990.
• «Encuentros Internacionales de Financiación Empresarial». (International Meetings on Business Financing), seminar conducted on: «La gestión financiera para la empresa del futuro» (Financial management of business in the future). Faculty of Economic and Business Sciences. Bilbao May 14, 15 and 16 1990.
• Seminar conducted on: «Técnicas Operativas para la Gestión Financiera». (Operative Techniques for Financial Management). IDEGA (Institute for Study and Development of Galicia) June 19 and 20, 1990. La Coruña.
• V Hispano-Portuguese Congress on Scientific Management. Speaking on: «Ensayo sobre un modelo de diagnóstico económico-financiero» «Trial on a model of economic-financial diagnosis) Business School. Vigo, September 26, 27, 28 and 29, 1990. Published.
• VIII Seminar-Convention on Management Leadership and Sales-Marketing. Paper given on: «Planteamientos Económico-financieros y Comerciales para el futuro de las empresas» (Economic-Financial and Commercial planning for business in the future). Alicante, November 10 and 11, 1990.
• Seminar conducted jointly with Professor Arnold Kaufmann, on: «Tecnicas de Gestión basadas en la intervención de expertos». (Management techniques based on the intervention of experts). Faculty of Economic Sciences of the Barcelona University, November 13 and 14, 1990.
• Seminar third cycle. Doctoral Programme «Economía Financiera y Contabilidad» (Financial Economy and Accountancy) Title : «Aplicaciones de la Teoría de los subconjuntos borrosos a la Gestión Financiera» (Applying the theory of fuzzy subsets to financial management) Valencia February 14 and 15, 1991.
• Doctoral Seminar: «Modernas técnicas de gestión financiera para la incertidumbre». (Modern techniques of financial management in uncertainty). Faculty of Economic and Business Sciences of the University of Leon. April 9 and 10, 1991.
• Course on Business Management organized by J. Morera Jansá S.A. Seminar on: «Técnicas de Gestión Financiera». (Techniques of Financial Management). Alicante April 15 and 22, 1991.
• Doctoral Course: «Economía Financiera avanzada» (Advanced financial economy) at the Faculty of Economic and Business Sciences of the University of Alicante, April 22 and 23, 1991.
• Participation as an expert in the 1st Congress on Social Economy in Galicia with the subject «Crédito cooperativo y trabajo asociado» (Co-operative credit and associated work). Vigo May 9, 10 and 11, 1991.
• Seminar on: «La Gestión de empresas mediante la utilización de sistemas expertos» (Business Management by means of the use of expert systems) Business School of Vigo. May 21, 1991.
• Seminar on: «Técnicas de gestión de empresa a través de la opinión de expertos. (Business management techniques employing the opinion of experts) Faculty of Economic and Business Sciences. Santiago de Compostela May 21 and 22, 1991.
• XI Euro Congress on operative investigation. Selection of Affinities by means of fuzzy relations and Galois lattices. Aachen (Germany) July 16, 17, 18, 19, 1991.
• Symposium on: «Sistemas Borrosos e Inteligencia Artificial: (Fuzzy Systems and Artificial Intelligence) Member of the International Committee of Councellors of Fuzzy Systems & A.I. Simposium. Iasi Fsai'91 - October 10-12, 1991. (Romania).
• I Spanish-French Congress on Management and Economy of Companies organized by AEDEM. Course on «La programación de actividades por el método del semáforo». «Programming of activities by means of the traffic signal system»(jointly with A. Kaufmann). Reus, October 23, 24 and 25 1991.
• Galician Congress on Consumption. Course on «A vivenda e o consumidor» (Houses and/or consumer). Lugo December 11, 12 and 13, 1991.
• Seminar conducted jointly with Professor Arnold Kaufmann on «Técnicas Operativas para la Dirección Estratégica» (Operative Techniques for Strategic Management) Faculty of Economic Sciences of the Barcelona University, February 18 and 19, 1992.
• Doctoral Seminar. Programme on Financial Economy. «Aplicaciones de la Teoría de los Subconjuntos Borrosos a la gestión Financiera» (Application of the theory of fuzzy subsets to financial management). Faculty of Economic and Business Sciences of the Valencia University, March 30 and 31, 1992.
• Seminar on «Nuevas Técnicas de Gestión en la Incertidumbre». (New techniques of management in uncertainty). Department of applied economy of the University of the Basque country and University School of Business Studies of San Sebastían, April 27 and 28, 1992.
• I European Congress on Business Management and Economy. Paper presented on: «Incidencia de la Fiscalidad en la decisión de invertir en ambiente de incertidumbre». (Fiscal incidence on the decision to invest in an atmosphere of uncertainty). Huelva May 27, 28 and 29, 1992.
• Doctorate Seminar. «Técnicas Secuenciales de Gestión». (Sequential management techniques). Business economy department. Leon University June 8 and 9, 1992.
• International 92 Gèneva Conference SIGNALS & SYSTEMS. Report: «Phénomènes economiques chaotiques de croissance» (Chaotic economic phenomena of growth) (jointly with Professor Teodorescu) and A chaotic fuzzy model for a management problem (jointly with Prof. Teodorescu and Prof. Gil Lafuente). Geneva June 17, 18 and 19, 1992. (Switzerland).
• 2nd. International Conference on Fuzzy Logic Systems and Neural Networks. Paper presented on: Chaotic Fuzzy Models in Economy (jointly with Professors A.M. Gil Lafuente, N.H. Teodorescu and A.P. Tacu). Iizuka (Japan) July 17-22, 1992.
• International Fuzzy Systems Symposium ISKIT'92. Paper presented on: Periodicity and Chaos in Economic Fuzzy Forecasting (jointly with Professors A.M. Gil Lafuente and N.M. Teodorescu). (Japan), July 12-15, 1992.
• Second International Conference of the Balkanic Union for Fuzzy Systems and Artificial Intelligence. Speaking on: Investments decisions in a context of uncertainty. Karadeniz Technical University. Trabzon (Turkey) August 31 - September 5, 1992.
• Deuxième Congrès Franco-Espagnol de Management des Entreprises. Le management des entreprises dans l'espace économique européen. (Second French-Spanish Congress on Business Management. Business Management within the European economic area. Bordeaux (France) September 24 and 25, 1992.
• International Conference on Fuzzy Systems & Artificial Intelligence. Speaking on: The economic environment in the decision of Investment within a context of Uncertainty. Iasi (Romania) October 28-31, 1992.
• Participation in «Deuxièmes Journées Nationales. Les applications des ensembles flous». «Second National Conference. Application of fuzzy sets», in honour of professor A. Kaufmann. Nimes (France) November 2-3, 1992.
• Seminar conducted jointly with Professor A. Kaufmann on «Técnicas de Gestión de empresas. Previsiones, decisiones y estrategias». (Techniques in businessmanagement. Forecasts, decisions and strategies) Faculty of Economic Sciences of the Barcelona University, November 24 and 25, 1992.
• VI Luso-Spanish Scientific Management Conference. Speaking on «Modelo de selección de inversiones con desconocimiento de las magnitudes económico-financieras».«Model for selection of investmnent with no knowledge of the economic-financial variables». (Published). Funchal (Portugal), December 10-12, 1992.
• Third Cycle Seminar «Aplicaciones de la Teoría de los Subconjuntos Borrosos a la Gestión de la Empresa». «Applications of the Theory of Fuzzy Sub-sets to Business Management». Valencia University, March 22 and 23, 1992.
• International Discussion. «Métropoles et Aménagement du Territoire». Paris, May 12 and 13, 1993.
• VII National Congress and III Spanish-French Congress of AEDEM. Speaking on: «La estimación de magnitudes económicas en el proceso de inversión» «Estimate of economic variables in the investment process». (Published). Cordoba (Spain), June 2, 3 and 4, 1993.
• 6th Congress INTERKIBERNETIK'93. «Recurrent processes, hidden effects, and chaos in economics and biology». With N.H. Teodorescu, A.P. Tacu, A.M Gil Lafuente and A. Brezulianu. Iasi (Romania), August 23-26, 1993.
• International Seminar on systems: Member of the Scientific Committee of the «International AMSE Conference SYS'93". «Fuzzy Signals and Systems, speaking on, «Creativity, chaos and fuzziness» (with V. Belous, and N.H. Teodorescu), and «Modelling complex phenomena by networks of fuzzy systems» (with N.H. Teodorescu, V. Belous, E. López González, A.M. Gil Lafuente). London (Great Britain), September 1-3, 1993.
• II European Congress of AEDEM. Speaking on: «FAMM (Fuzzy Adverse Minimum Method). (Published). Minsk (Belorussia), September 20-22, 1993.
• Doctorate Course. «Métodos cuantitativos en el Análisis Histórico». «Quantitative Methods in Historical Analysis». Title «Economic Management in Uncertainty». Santiago de Compostela University, March 2, 1994.
• Postgraduate Course in Directing and Management of Co-operatives and Small and Medium Sized Businesses. Santiago de Compostela University, March 2, 1994.
• Third Cycle Seminar. Doctorate Programme: «Economía Financiera y Matemática». «Financial and Mathematical Economy». Title: «Aplicaciones de la Teoría de los Subconjuntos Borrosos a la Gestión de la Empresa» «Applications of the Theory of Fuzzy Sub-sets to Business Management». Valencia (Spain), March 14-15, 1994.
• Course given on: «Introducción a la Teoría de los Subconjuntos Borrosos». «Introduction to the theory of Fuzzy Sub-sets». Rovira i Virgili University. Reus (Spain) February and March, 1994.
• Seminar, conducted jointly with Professor Arnold Kaufmann, on: «Técnicas especiales para la Gestión de Expertos». «Special techniques for managing experts». Rovira i Virgili University, Reus, May 16 and 17, 1994.
• VIII National Congress and IV Spanish-French Congress of AEDEM. Speaking on: «La selección de inversión en base a criterios diversificados». «Investment selection based on diversified criteria». Cáceres (Spain), June 8, 9 and 10, 1994. (Published).
• International AMSE Conference: Symposium on Fuzzy Systems & Neural Networks SYS'94. Speaking on: Criterial Selection of investments within a context of uncertainty». (Published). Pages 61-71 of Volume I of the Proceedings. Lyon (France), July 4-6, 1994.
• 3rd. International Conference on Fuzzy Logic, Neural Sets and Soft Computing. Speaking on: Analysis of Chaotic Trade Models and Improved Chaotic Fuzzy Trade Models». (jointly with N.H. Teodorescu and others). Published in the Proceedings, pages 399-450). Iizika (Japan), August 1-7, 1994.
• III European AEDEM Congress. Speaking on: El fenómeno del desgaste en un proceso de cambio». «The phenomenon of wear and tear in a process of change». Published in the Proceedings, pages 435-449. Bucharest (Romania), September 5-7, 1994.
• Conference given at the IV Spanish Congress on Fuzzy Technology and Logic: «La incertidumbre en la economía y gestión de empresas». «Uncertainty in business economy and management». (Published). Blanes (Spain) September 14-16, 1994.
• Spanish-French Seminar on Prespectives of research in Financial Analysis. Speaking on: «Posición del Análisis Financiero en las finanzas empresariales» «Position of Financial Analysis in business finances». (With A.M. Gil Lafuente). Reus (Spain), September 23-24, 1994.
• Third BUFSA International Conference of Fuzzy Logic, Neural Networks & A.I. Speaking on: «The reduction of subjectivity in uncertain economic models». Bucharest (Romania), October 28-30, 1994.
• I International Congress on Fuzzy Management and Economics (SIGEF). Speaking on: «La colocación óptima de recursos financieros. El modelo ISFUNE». «Optimum placing of financial resources. The ISFUNE model». (Published). Reus (Spain), November 16-18, 1994.
• Doctorate course: «Matemática aplicada a la contabilidad y a la empresa». «Mathematics applied to accountancy and business». Title: «Gestión financiera de la empresa». «Financial business management». (30 hours). Gerona (Spain), February, 1995.
• Third cycle seminar. Doctorate Programme. «Economía Financiera». «Financial economy». Title: «Aplicación de la Teoría de Subconjuntos Borrosos a la Gestión de la Empresa». «Applcation of the Theory of Fuzzy Sub-sets to Business Management». Valencia (Spain), March 27 and 28, 1995.
• IX National Congress and V Spanish-French Congress of AEDEM. University of Castilla-La Mancha, Toledo (Spain), May 2-5, 1995.
• Doctorate Course: «Nuevas tendencias en dirección de empresas». «New tendencies in business management». Title: «Hacia un nuevo paradigma de selección de inversiones en la incertidumbre». «Towards a new paradigm in the selection of investments in uncertainty». Leon (Spain), May 29 and 30, 1995.
• International AMSE Symposium. Speaking on: «Investment when criteria are not specified». (Published). Brno (Chezk Republic). July 3-5, 1995.
• IV European AEDEM Congress. University of National and World Economy. Sofía (Bulgaria) September 18-20, 1995.
• IX Seminar-Convention on management leadership and sales-marketing. Speaking on: «La gestión de la empresa en el año 2000». (Business Management in the year 2000). Alicante (Spain), October 21 and 22 1995.
• II International Congress on Management and Fuzzy Economy. Speaking on: «Modelos no numéricos de asignación en la gestión de personal» (Non numerical models of assignment in personnel management) (published). Santiago de Compostela (Spain), November 15-17 1995.
• Round Table Discussion on «Tendencias actuales de investigación en Gestión y Economía Fuzzy». (Current investigation trends in management and fuzzy economy) Galician School of Political Studies. Santiago de Compostela (Spain), November 17, 1995.
• Doctoral course: «Investigación Operativa Superior». (Higher Operative Investigation) Faculty of Economic and Business Sciences. Rovira i Virgili University. Reus (Spain). December 1995-January 1996 (22 hours).
• Third Cycle Seminar. Doctoral Programme «Economía Financiera» (Financial Economy). Title: «Técnicas de Gestión mediante Redes Neuronales en la Incertidumbre» (Management techniques by means of neural networks in uncertainty). Valencia (Spain) February 20 and 21, 1996 (10 hours).
• Seminar «Xarxes Neuronales per a l'Economia i la Gestió d'Empresas» «Neural networks for the business economy and management».University of Girona. Girona (Spain), March 6 and 18 1996 (8 hours).
• Discussion on «Patrocini, mecenatge i llei de fundacions» «Sponsorchip, patronage and the foundations law» at the «Jornades de Temes d'Actualitat en la Gestió d'Entitats Esportives» «Meeting on Current Subjects in the Management of Sporting Entities» Faculty of Economic and Business Sciences. Barcelona University. Barcelona (Spain) March 14, 1996.
• Symposium in tribute of Grigore Moisil. Work submitted: Doi fondatori ai logicii nuantate: Grigore C. Moisil and Arnold Kaufmann. Iasi (Romania) March 15, 1996.
• Spanish-French Seminar on : «Investigación en Análisis Financiero» (Investigation in Financial Analysis). University of Paris IX-Dauphine. Paris (France) May 16-17 1996.
• X National Congress and VI Spanish-French AEDEM Congress «Asociación Europea de Dirección y Economía de la Empresa» (European Association of Business Management and Economy) University of Granada. Granada (Spain) June 11-14, 1996.
• International Conference on Intelligent Technologies in Human-Related Sciences of AMSE. Plenary conference: Programming Investment Activities (published) León (Spain), July 5-7 1996.
• Round table discussion on «El futur de l'estat de benestar» «The future of the welfare state» at the M. Carrasco i Formiguera Summer School. Platja d'Aro (Spain), July 13, 1996.
• V International Congress of the European Association of Business Management and Economy. University of Prague. Prague (Czech Republic) September 9-11 1996.
• III Rencontre International ACSEG (Approches Connexionnistes en Sciences Economiques et de Gestion «Coonnectionist approaches in Economic and Management Sciences». Inaugural conference: «Les approches connexionnistes dans le changement du paradigme de la theórie de la décision» «Connectionist approaches within the changing paradigm of the theory of decision» (published) Nantes (France), October 25, 1996.
• Third Cycle Seminar. Doctoral Programme «Economía Financiera» (Financial Economy). Title: «Aplicaciones de la Teoría de los subconjuntos borrosos a la gestión de la empresa» (Application of the theory of fuzzy subsets to business management). Valencia (Spain) October 28 and 29, 1996 (10 hours).
• III International Congress of Management and Fuzzy Economy (SIGEF). Inaugural conference: «Lances y desventuras del nuevo paradigma de la teoría de la decisión» «Critical moments and misfortunes of the new paradigm of the theory of decision». (published) Proceedings, Volume I. Buenos Aires (Argentina), November 10-13 1996.
• Round table discussion on «La incertidumbre» (Uncertainty) Chamber of Commerce of Buenos Aires (Argentina) November 13, 1996.
• XIX Meeting of the EURO Working Group on Financial Modelling. Speaking on: Financial Modelling in the New Paradigm of the Theory of Decision. Chania-Crete (Greece) November 28-30 1996.
• Conference on: «Pasado, presente y futuro de la economía de la empresa» (Past, present and future of business economy). Subject: «Modelos y técnicas de gestión» (Models and management techniques) and «Modelos y técnicas de gestión de las finanzas» (Models and techniques of financial management) . University of the Basque Country, January 30-31, 1997.
• Doctoral Course on: «Investigación Operativa Superior» («Higher operative investigation» Faculty of Economic and Business Sciences. Rovira i Virgili University. Reus (Spain). December 1996-January 1997 (22 hours).
• Seminar on «Teoria dos subconxuntos borrosos e aplicacions» (Theory and application of fuzzy subsets). University School of Business Studies of Lugo, Lugo (Spain) February 7-8, 1997.
• Postgraduate Course on: «Dirección e Xestión de Copperativas e Peme's». (Direction and Management of Co-operatives and Small and Medium Sized Companies). Direction and Financial Calculation Module. Santiago de Compostela University, Snatiago de Compostela (Spain) February, 1997.
• Round Table (Norddentsche Tafelrunde) on «Ciencias Aplicadas a las Instituciones y Empresas». «Science applied to institutions and Businesses». German Society of Applied Science. Bremen (Germany), May 23, 1997.
• XI National Congress and VII Spanish-French Congress of AEDEM «European Association of Business Management and Economy». University of Lérida, Lérida (Spain) June 17-20, 1997.
• International Symposium on Intelligent Systems ISIS'97. Plenary conference: «The affinities theory in economics and management». (Published). Reggio Calabria (Italy), September 11-13 1997.
• VI International Congress of the European Association of Business Management and Economy. Polytechnic University of Chania. Speaking on: «Las afinidades entre productos en la nueva teoría de la decisión». «Affinities between products in the new theory of decision». Proceedings pages 589-602. Chania (Greece) September 15-17, 1997.
• IV International Meeting of ACSEG. Speaking on: «Les affinités dans le nouveau paradigme de la théorie de la decision». «Affinities in the new paradigm of the theory of decision». Published in the ACSEG proceedings. Tours (France), October 24, 1997, pages 206-217.
• III International Conference on Modelling and Simulation AMSE. Speaking on: «Model for assembling products by means of Clans». (Published). Proceedings, pages 496-504. Melbourne (Australia) October 29-31, 1997.
• IV International Congress on Fuzzy Management and Economy (SIGEF). Inaugural speech: «La ordenación en la nueva teoría de la decisión». «Order in the new theory of decision». (Published), Volume III, Santiago de Cuba (Cuba), November 17-19, 1997.
• IV Journées Catalanes de Mathématiques Appliquées (IV Catalan Meeting on Applied Mathematics). Conference: «Concept and Importance of Order in the New Paradigm of the Theory of Decision». (Published). Proceedings pages 47-60. Tarragona (Spain) February 11-13, 1998.
• Third Cycle Seminar. Doctorate Programme: «Economía Fianciera». «Financial Economy». Title: «Decisiones de inversión en la incertidumbre». «Decisions to invest in uncertainty». Valence (Spain), February 19 and 20 , 1998. (8 hours).
• XIX AFC Congress (French Accountancy Association). Speaking on «El concepto de relación en el Análisis Financiero». «The concept of relation in Financial Analysis». (Published). Proceedings, Nantes (France) May 14-16, 1998.
• International AMSE Conference on Contribution of Cognition to Modelling. Claude Bernard University of Lyon (France), July 6-8, 1998.
• VII International AEDEM Conference, Bogaziçi University of Istanbul (Turkey), September 8-10, 1998.
• International AMSE Conference on Systems and Signals in Intelligent Technologies. Belarus State University of Minsk (Belorussia) September 28-30, 1998.
• V International Meeting of ACSEG. Speaking at the plenary session on: «Accumulative and non-accumulative forms in levels of relations». (Published» Proceedings (no pages ). Louvain-la-Neuve (Belgium) November 20, 1998.
• V International Congress of Fuzzy Management and Economy (SIGEF). Speaking on: «Decision by means of interconnecting relations». Published in the Proceedings (No general paging) Lausanne (Switzerland) November 24-27, 1998.
• Third Cycle Seminar: Doctorate Programme «Financial Economy». Title «Aplicación de la teoría de los Subconjuntos Borrosos a la Gestión de la Empresa» «Application of the theory of Fuzzy Sub-Sets to Business Management». Valencia (Spain), May 11 and 12, 1999
• 44th. World Conference of the International Council for Small Business ICSB'99. Chairman of Workshop "Lean Tools: the Fuzzy Logic for Small Businesses". Naples (Italy), June 20-23, 1999.
• International AMSE Congress (Association for Modelling and Simulation Techniques in Enterprises) Plenary Conference: Fuzzy Neural Graphs for Management. Published in Development and Practice of Artificial Intelligence Techniques, pages 13-19. Durban (South Africa) September 24-26, 1999.
• VI International Congress on Fuzzy Management and Economy (SIGEF) Michoacan University of San Nicolas de Hidalgo, Morelia (Mexico), November 15-17, 1999.
• VI International ACSEG Meeting "Advances in Computational Management". Rovira i Virgili University, Reus (Spain), December 10, 1999.
• IX Course for especialisation in management and direction of litlle and mediun cooperative societies. Santiago de Compostela University (Spain) January 2000.
• Third Cycle Seminar. Doctorate Programme. Title: "Aplicaciones de los subconjuntos borrosos a la gestión de la empresa" (Application of fuzzy sub-sets to business management) Valencia University. Valencia, February 10 and 1, 2000.
• Seminar "Sistemi di monitoraggio ambientali basati su reti neurali" «Leardership system based on neural networks». Consorzio InnovaReggio Villa San Giovanni (Italy). March 20, 2000.
• International Conference AMSE on Modelling and Simulation. The Caire (Egypt) April 11-14, 2000.
• Course of universitary extension and postgraduate "Gestió financera i fiscal de les Entitats Esportives 1999-2000" «Financial and fiscal management of sportives societies 1999-2000». Barcelona University (Spain) April 2000.
• XVI National Congress- X Spanish-French Congress of AEDEM European Association of Business Management and Economy). Jaen University. (Spain) June 7-9, 2000.
• IX Congress International of AEDEM. Plenary Session. Temuco (Chile) September 5-7 2000.
• VII International Congress of fuzzy management and economy (SIGEF). Technical University of Crete and Mediterranean Agronomic Institute of Chania (Greece) Sptember 18-20, 2000.
• International Conference on Modelling and Simulation MS´2000 Las Palmas de Gran Canaria University. (Spain. September 25-27, 2000)
• Special meeting on "Nuevos desafios de la Economía de la Empresa" (New challenges for Business Economy) in memory of Profesor Emilio Soldevilla. Paper preented: "Entre la epistemologia y la lógica . Decisión y algoritmo de ordenación" (Betwen epistemology and logic. Decision and algorithm for order). FESIDE Foundation, Bilbao (Spain) January 19, 2001.
• Third Cycle Seminar. Doctorate Programme. Title "La incertidumbre en la gestión financiera de la empresa" (Uncertainty in business financial management). Valencia University, February 22 and 23, 2001.
• International Conference on Communications, Signals and Systems CSS´01. Institut National des Postes et Telécommunications. Rabat (Morrocco). March 19-21, 2001.
• XV National Congress- XI Spanish-French Congress of AEDEM (European Association of Business Management and Economy).Paper: "Enseñanzas de Tercer Ciclo: Doctorado" (Third cycle principles: Doctorate). Las Palmas de Gran Canaria University. June 13-15, 2001.
• International Conference of the European Association of Management and Business Economics. Facoltà di Ingegnieria. Università di Reggio Calabria. Reggio (Italy), September 4-6, 2001.
• International Conference "New Economic Windows. New Paradigms for the New Millenium". Conference: "Treatment of Uncertainty in New Economy" (published in CD ROM Congress. Università degli Studi di Salerno (Italy), September 13-15, 2001.
• VIII Conference International of SIGEF "New logics for the new economy" University of Studies de Naples "Federico II" (Italy). September 20-21, 2001.
• "Situation et perspective de la mathématique de l´incertain dans la gestion des entreprises" (Mathematics Situation and Perspective in uncertainty in business management) International Seminar (10 hours). La Réunion University. Investigation groupe GREGEOI. Saint-Denis (France). November 5-9, 2001.
• International Conference on "Business Decision and Technology BDT´02. Inauguration Conference: "A no-numerical theory of decision in uncertainty". Kuwait University. Kuwait City. Kuwait 18-20 march 2002.
• XVI National Congress-XII Spanish-French Congress of AEDEM "The fuzzy enterprise". University of Alicante ( Spain ). Alicante Juin 5-7,2002.
• International Conference on modelling and Simulation in Technical and Social sciences, MS'2002. Gerona University (Sapin). Chairman in a work session. Gerona Juny 25-27, 2002.
• XI International Conference of European Asociation of Management and Enterprise Economy "The Enterprise limits". University of Paris-Dauphine. Paris ( France ) September 2-4, 2002.
• IX International Congress of SIGEF. Ponent in a plenary session. Mérida ( Venezuela ) November 25-27, 2002.