The fourth book of the 20th century of Tunja´s collection examines the first exercise of modern urbanism, the "Pilot Plan 1958-1985", whose objective was to regulate territorial growth, although only some of its precepts were applied. In short, conflicting interests led to the development of property by ownership, disorder, incompleteness, and informality. The chapters deal with: the first, the transformation in the period; the second, forms of urban growth; the third, the urban transformation by the pilot plan of 1958; the fourth, the provision of public household services; the fifth, public spaces; the sixth, industrial equipment and facilities and, the seventh, urbanizations of formal and informal housing.&nbsp