The performance of modified bitumen roofing systems is influenced by several key process parameters. These include the type and percentage of polymer used for modification, the temperature during the blending process, and the viscosity of the bitumen. Additionally, the application method, curing time, and environmental conditions during installation play critical roles. Proper control of these parameters ensures optimal adhesion, flexibility, and durability of the roofing system, enhancing its overall performance and lifespan.