This book is the product of an innovative methodological experience that we would like to testify about, which may be inspiring for future actions in other places. The book results from a collaborative and interdisciplinary working experience that involved researchers, graduate students and local stakeholders, carried out in a workshop setting. The workshop — the Lisbon/Barreiro NoVOID Workshop — has embodied the kick-off of the last phase of the project that frames our research. Its main goal was creating an interdisciplinary academic opportunity for sharing and debating unconventional design solutions for urban derelict areas, involving graduate students and specialists from architecture, urbanism, landscape architecture and geography.