Designing high performance buildings requires a proper consideration of solar exposures and indoor climate conditions so as to also achieve energy reduction targets. Solar shading systems with tilting metallic slats are commonly used to control light and energy transfer to the interior. However, a precise characterization of their performance has to include many parameters, which are not always easily available. Very often, component level metrics are used to compare solutions, but these are neither consistently related to a specific context nor they are reliable enough for more complex building envelope combinations. This study identifies the factors that most relevantly impact on the robustness of performance outcomes and focuses specifically on the scattering properties of metallic surfaces on simulation results.