Sarah Van Hollebeke is a PhD student in sociology (grant Fresh-FNRS) at the Catholic University of Louvain (member of the interdisciplinary research center Democracy, Institutions, Subjectivity, CriDIS) and in urbanism at the Grenoble National School of Architecture (member of the Research Center on sound space and urban environment, CRESSON). Her work focuses on the aims of urban observation and communication of knowledge in Brussels urban spaces, in the field of urban planning. She interrogates the adequacy between these goals and the tools used (such as maps, statistics, powerpoint, etc.) in workshops or conferences, in three spheres of urban knowledge production.