Among urban designers and municipal officials, the term encroachment is defined as a deviation from the official master plan. But in cities today, such informal modifications to the urban fabric are deeply enmeshed with formal planning procedures. Master Plans and Encroachments examines informality in the high-modernist city of Islamabad as a strategic conformity to official schemes and regulations rather than as a deviation from them. For the new administrative capital of Pakistan designed in 1959 by Greek architect and planner Constantinos A. Doxiadis, Islamabad’s master plan offers a...