Research on interfacial phenomena was concerned with measurements of the critical micelle concentration (CMC) and partition coefficients of synthetic and petroleum sulfonates, and with evaluating the role of alcohols in dilute surfactant flooding processes. Polymer rheology and fluid mechanics experiments involved determination of the flow characteristics of selected polymers, and studies of surfactant/polymer interactions. The molecular theory developed for aqueous solutions has been extended to cover chain paraffin species with some success. Research in rock/fluid interactions involved studies on the salting-out of surfactants by NaCl, the precipitation of surfactants by multivalent cations, the CMC of surfactants by the dye solubilization technique, on polymer analysis, and on the state-of-the-art survey of surfactant losses by precipitation.