João Rapagão OODA is a Portuguese architecture collective, now celebrating 10 years of practice. Based in Porto with experience gained internationally in notable offices, such as OMA-Rem Koolhaas and Zaha Hadid Architects, the collective aims to expand internationally, namely New York, São Paulo and Shanghai. With a wide range of work (whether idea or built, new or rehabilitation) and participation in international competitions in Africa, America, Asia, Middle East and Europe, their work includes partnerships with Kengo Kuma and the Pritzker prize Souto de Moura. More than presenting and dissecting the work of the practice, this book is an adventure in technical and artistic exchanges. It is divided into three parts; the appraisal of the first ten years, hence the X mark - X - in the title of the book and also predictions for the next ten; a presentation of case studies and projects according to six criteria and knowledge approaches –