In recent years the entire legal and regulatory basis of the Portuguese Planning System underwent an ambitious and far reaching reform. However, today like in the past, the major effort in the production of new legislation and regulation was not accompanied by a similar effort in the production of planning doctrine, here understood as a vast and coherent set of planning policies and implementation measures, able to improve, from a technical and scientific point of view, and under an evidence based approach, not only the quality of planning practice but also, and foremost,its proactive role, incorporating new and emerging topics and societal challenges and concerns, promoting change and opening new transition avenues into the future. This proactive role of planning, advocated here, contrasts with its traditional conservative standing in Portugal (and in other EU Member States), of looking backwards and passively accommodating, if not slowing down, change and the social and physical reform of our cities and metropolises.   Planning can, and should, constitute a transformative device in our cities in Europe and elsewhere, particularly in the present times and with a view into the long term. Indeed, current changes seem far more deep within the existing urban tissues experiencing profound recompositions of functions and activities, than in physical terms, strictly speaking,where past investments in infrastructures and in the built environment seemed to have exceeded the real demand and generated a surplus of the building stock that, some years later, still remains partially empty or underused.   The Spatial Planning for Change (SPLACH) programme draws on some of the main areas of knowledge of thre eresearch centres CITTA, DINÂMIA'CET-IUL and GOVCOPP. Two to three main areas of knowledge were identified for each centre: post carbon cities, transformative policies, spatial planning, socio-technical system, food security,services of general interest, tourism and modeli...