On October 23, 1989, the Spanish newspaper El Mundo was created. The first edition came with a Sigma Dos' poll as the first headline one week before the general elections were held in Spain. This milestone constituted a “journalistic declaration of intent” according to Joaquín Manso, director of El Mundo, and Gerardo Iracheta, president of Sigma Dos. In an event that brought together more than a hundred personalities from politics and journalism at the Ritz hotel in Madrid, the Mayor of the city, José Luis Martínez-Almeida, addressed about how polls affect politicians: “if the figures are good for us, we try to control the euphoria and keep working; If they are less good, we must analyze them and also keep working.” A video that summarized the common 35 years history between El Mundo and Sigma Dos and contained congratulatory words from Kancho Stoichev, President of GIA, was projected during the event.

Both Iracheta and Manso have recalled the necessary dialogue between democracy and journalism, a relationship that, in the case of El Mundo and Sigma Dos, according to the president of Sigma Dos, has been based on “loyalty, professional respect and autonomy.”
The event was also attended by the executive president of Unidad Editorial, Marco Pompignoni, as well as the presidents of La Rioja, Gonzalo Capellán de Miguel; from Murcia, Fernando López Miras and from Castilla y León, Alfonso Fernández Mañueco. Other politicians from different parties have also accompanied El Mundo and Sigma Dos on their silver anniversary: Cuca Gamarra, general secretary of the PP; Elías Bendodo, general coordinator of the PP; Juan Lobato, on behalf of the PSOE; Rocío Monasterio, from Vox; the former president of Congress, Ana Pastor; the former Minister of Public Works, Pepe Blanco, the former Mayor of Madrid, José María Álvarez del Manzano and the former secretary general of CCOO, Antonio Gutiérrez. On behalf of Sigma Dos were its CEO, Luis Hernández; the General Manager, Rosa Díaz; the Market Research Manager, Miguel de la Fuente and the Chief Communication Officer, Antonio Asencio.

Numerous personalities from civil society, journalism and culture attended the event. Among them, Luis Arroyo, president of the Ateneo de Madrid; José Andrés Torres Mora, president of Acción Cultural Española or Antonio Fernández, president of ADEPI.

At the end of the meeting, attendees were given a commemorative book with a selection of the most significant covers of El Mundo with surveys by Sigma Dos. Three former Presidents of the Government, José María Aznar, José Luis Rodríguez Zapatero and Mariano Rajoy, commented in the book their experience with polls in their political career, along with other politician, journalists and personalities from the last three decades of the history of Spain.