In this talk we will discuss the formation of mounds during epitaxial growth studied by kinetic Monte Carlo (KMC) simulations as well as Island Dynamics simulations that employ the level set method. In the presence of a step edge barrier (that induces an uphill current) mounds form during epitaxial growth. The slopes of these mounds are stabilized by a downward transport mechanism. We study two different downward transport mechanisms, referred to as downhill funneling and transient mobility. Our results show that the scaling exponents that are associated with mound formation depend continuously on the model parameters.