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Este artículo recoge el estudio realizado en las viviendas flexibles de Carabanchel (Madrid), de los arquitectos Aranguren y Gallegos. Se trata de una evaluación pos-ocupación del edificio que ofrece información relevante acerca de la experiencia real de los usuarios, de su interacción con la arquitectura flexible del proyecto, y de las fortalezas y debilidades de la flexibilidad en el contexto español. El objetivo último del trabajo es saber si las estrategias flexibles del proyecto ofrecen en la práctica más libertad de uso del espacio doméstico a las familias, y bajo qué condiciones estas estrategias podrían ser replicadas en nuevas promociones de vivienda. La presencia y la edad de los hijos, el nivel educativo de los propietarios, y el sistema de adjudicación de las viviendas se revelan como factores críticos para determinar la actitud (a favor o en contra) de los usuarios con respecto a la flexibilidad.

The competition for the housing estate of PREVI (Proyecto Experimental de Vivienda -- Experimental Housing Project), carried out in 1969, in Lima, happened in a specially fruitful moment of reflections concerning changes of architecture and, mainly, of the cities. In this context of criticism, issues as the citizen participation and the change of architecture over time became central and influenced decisively in the proposals of 13 international teams that participated in the competition in Peru. This projectual lab, promoted by the Peruvian government with UN funds, became, according to the opinion of the authors of the present article, a fundamental experience in social housing in Latin America in the 20th century, concentrating seminal projects whose ideas still reverberate nowadays. If all international teams invited to participate in the contest already had, at the time, a significant repertoire in the housing issue and had a good understanding with the critical production of their contemporaries, the Polish team, with Oskar Hansen and Svein Hatloy, brought to Peru a very peculiar work experience that they had been developing in Eastern Europe. Two structuring concepts of practical and theoretical practice of Oskar Hansen and his wife, Zofia Hansen -- the 'Open Form' and its deployment in urban scale, the 'Linear Continuous System' (LCS) -- appear in the proposal for PREVI as instruments in the search for a flexible architecture in space and time, open to participation and intervention of the dweller and adequate to his/her sociocultural peculiarities. Therefore, the present article aims at redeeming, in a more specific clipping, the guiding ideas of the Polish proposal for the contest, and, in a broader sense, raising the importance of PREVI as fundamental reference for social housing projects nowadays. [ABSTRACT FROM AUTHOR]