Lab Theory A seeks to theorize architectural practice by analyzing design actions rather than focusing on theoretical interpretation. It aims to unpack architectural design through references to contemporary debates and a role game about urban transformations, aiming to simulate the action (practice) and to foster reflections on the action (theory). The game proceeds in parallel with a series of thematical reading seminars that allow to position it within a wider frame of debate. After three editions set in the city of Detroit and Stazzema (video trailer), this year the game took place in the town of Kiruna, Sweden, which developed around one of the world's largest iron ore mining sites. Excavation activities have changed the history of that land and its native peoples, just as their expansion is now leading to the relocation of a large part of Kiruna. Challenged with these fundamental questions, students play the game from the multiple perspectives of real actors: through cycles of production, exchange and revision, design is discussed and employed as a political tool, and its agency in complex social and technical settings is analysed and questioned.