The key process parameters influencing polymer modified bitumen (PMB) include the type and concentration of polymer, mixing temperature, shear rate during blending, and the duration of mixing. Higher temperatures facilitate better polymer dispersion, while optimal shear rates ensure uniformity. Additionally, the choice of bitumen grade and the presence of additives can significantly affect the performance characteristics of the modified bitumen, impacting its viscosity, elasticity, and overall durability in asphalt applications.