Stabilizing rock formations or blocks has been a combination of engineering and art and common techniques include rock bolts with or without cable lashing and/or nets. The recent development of SPIDER Nets lead to the SPIDER Rock Protection System for stabilizing rock formations. Further, the Ruvolum Rock Dimensioning program was changed for the SPIDER System and it is now a tool for engineers and designers to use. The program is used on-line and it allows the user to analyze sliding and toppling mechanisms. The program is based on Mohr-Coulomb Equilibrium theory and it establishes the relationship between driving and stabilizing forces. The program allows the user to input various site conditions, select anchor spacing and size and the result is an optimized arrangement for the given conditions. As part of the program development, the concept was modeled and tested under laboratory conditions. Field evaluation was completed in 2009 to further verify the program. The program has been successfully used for applications in place in Europe and Asia.