Editorial
E. Fernández

• Branching processes:Genealogy and Evolution. M. González, I.M. del Puerto
• Multi-armed restless bandits, index policies, and dynamic priority allocation. J. Niño-Mora
• Changes of classification in short term statistics: Calculation of restrospective series.  A. Fresneda, M. Ramos
• Teaching Independence and Conditional Probability. C. Díaz, C. Batanero, J. M. Contreras
  
• Statistics and Sustainability in Spain. A. Justel
• University Cooperation of Development: challenges and opportunities. G. Fiestras, B. Vitoriano
• Erich Lehmann (1917-2009). Obituary. M. A. Gómez