The results of the discussions and the conclusions that could be drawn from this workshop are summarized, especially with reference to the three questions that had been posed to the participants. The first question addresses the identification of criteria to determine when the colonization on a stone surface may be problematic. This requires compiling information on both the substrate and the microorganisms. The second deals with new methods for biocolonization control. This entails the development of eco-friendly compounds (e.g., biocides) methods of biocontrol, and development of long-and short-term management plans based on regular monitoring and simple maintenance practices. The final question aims to identify future research directions to achieve the two goals mentioned. Several topics were identified, ranging from rapid testing methods to interdisciplinary research methodology. Most significant was the recommendation to develop a practical database from the existing literature.