Artículos:

• Editorial. Ricardo Cao Abad and Domingo Morales González
• Random fuzzy sets: why, when, how. María Ángeles Gil, Ana Colubi and Pedro Terán
• Approximate solutions of multiobjective optimization problems. César Gutiérrez Vaquero and Lidia Huerga Pastor
• Use of administrative records in official statistics: a practical view. Amelia Fresneda Pacheco and Marina Pérez Julián
• Jean-Baptiste Estoup and the origins of Zipf ’s law: a stenographer with a scientific mind (1868-1950). Alain Lelu
• Initiatives on communication to increase the social and economic value of statistical information. Gregorio Izquierdo Llanes, Miguel de Castro Puente and Adolfo Gálvez Moraleda
• George E. P. Box (1919-2013). Obituary. Miguel A. Gómez Villegas
• Julio Ángel Pardo Llorente (1960-2013). Obituary. Pedro Miranda Menéndez