A macromolecular solution is represented by the simple model of rigid dumbbells suspended in a Newtonian fluid with Brownian motion included; hydrodynamicinteraction is taken into account. The expressions for the “diffusion equation” and the stress tensor are given. Example results using the equations for the rigid dumbbell suspension modified to include the hydrodynamicinteraction effect are obtained for two flows: steady shearing flow and small‐amplitude oscillatory motion.