• Research in Mathematics Education in Centros Regionales de Adiestramiento en Instrucción Matemática (CRAIM), San Juan , Puerto Rico, 1997.
  • Research and Innovation in Mathematics Education at the University of Maribor (Slovenia), Maribor, Slovenia, 1993.
  • Research and Innovation in Mathematics Education at the Univerza V Ljubljani (University of Ljubljana), Ljubljana, Eslovenia, 1993.
  • New Trends in Teacher Training. IBECIMA. Santiago de Chile. OEI, 1992
  • Research and Innovation in Mathematics Education at the Universidad Nacional de Colombia, Santa Fe de Bogotá, Colombia, 1991.