Descripción o resumen: n UNDOing is a technical consultancy and intervention office, created in 2015 with the aim of improving the environment, city and territory under the n'UNDO principles and their modes of action: * No Construction, * Minimization, * Reuse, * Dismantling This is a proposal to approach architecture from a different perspective. This title gathers and establishes the theoretical basis developed by n'UNDO since 2011, demonstrating that it is possible to build more and better from reduction, contention, and reasoned decline. According to n'UNDO, subtraction and renunciation are alternatives for pertinent and necessary interventions. From subtraction aims to be a tool for exchange and reflection, a meeting place for those who feel questioned, a basis for developing new lines of research and a stimulus for criticism, debate, and action