Development of a QGIS model for Rockfall risk assessment. Abstract: Characterized by their high velocity and substantial energy, rockfalls are among the most often occurring and dangerous natural events that seriously affect inhabited areas and important infrastructure. Ongoing changes in the weather and the environment have made it harder to accurately find and assess areas that are likely to have rockfalls. Even small changes can have a big effect on how much risk people are exposed to. So, for effective territorial management, it is important to have timely and reliable risk assessments that take into account how things change over time.