The Land and Urban Planning Law of 1956 (LS 1956) was the first Spanish urban planning code and imposed the principles and instruments for systematic land use planning. It was, therefore, an important step in the modernisation of urban planning legislation and in the application of urban planning, to which Spanish professionals, in tune with international thinking and economic and social issues, had been aspiring since the late 1920s. This issue of the journal Ciudades aims to take advantage of the opportunity provided by the seventieth anniversary of its approval to examine and examine in depth the institutionalisation of urbanism and urban planning, understanding it, in the sociological sense, as a process by which a phenomenon emerges and takes hold in a social group or in a society as a whole, that is, how it takes shape through the reflections, discourses and practices of individuals and the group to become part of reality.

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