(last 5 years)

  • Centro de idiomas, Universidad de Valladolid (Spain: 2020)
  • Colegio Ave María, Valladolid (Spain: 2017-2020)
  • Colegio Francisco Pino (Spain: 2020)
  • Colegio Internacional de Valladolid (Spain: 2007-2022)
  • John Mackintosh Hall, Gibraltar (UK: 2022, 2023)
  • Prior Park, Gibraltar (UK: 2025)
  • Sotogrande International School (Spain: 2025)
  • The University of Arizona (USA: 2024)
  • Universidad de Gibraltar (UK: 2022)
  • University of Texas at Austin (USA: 2024)
  • Univerzitet u Banjoj Luci, Banja Luka (Bosnia and Hercegovina: 2025)

previous data collection