Generally defined, prioritization is a process whereby an individual or a group place a number of items in rank order based on their perceived or measured importance or significance. In the Timbre context, prioritization is the process whereby a number of brownfields are evaluated, classified into groups or placed in rank order based on their perceived or measured importance or significance regarding their regeneration. This process is supported by a prioritization tool that has been developed in Timbre WP3. Prioritization allows stakeholders to distribute and direct limited available resources, time, and energy into those brownfield sites that are assessed to be the most critical, urgent, or profitable to address. The prioritization can be processed with sets of brownfields at different spatial levels or with sets of brownfields of different portfolios (cross-regional), applying various methodologies (working with different selections of factors and weightings) and depending on different prioritization criteria (e.g., a potential economic profit for investors, an urgency of action in respect to existing environmental hazards or health risks, actual political desires or requirements of local communities, efforts for the preservation of historical or architectural heritage, a potential for development of renewable energy projects).