Section headings and selected papers: Invited Lectures. Electrochemistry of passive membranes with neutral carriers, T R Berube et al. ISE selectivity and ion-exchange kinetics, K Cammann & S L Xie. Chemically modified electrode for liposome-mediated homogenous immunoassay, R A Durst & R M Kannuck. Gas phase biosensors, G G Guilbault. Ion-selective electrode function and solvent extraction parameters, J D R Thomas. Round Table Discussion. Model-based science of ion-selective electrodes, methodological background, A Lewenstam & J M Zytkow. Discussion Lectures. Characteristics of the iodide sensor based Ruzicka selectrode for cyanide determination, M V Budimir et al. Experimental study of the liquid junction potential between different solvents. A component related to ionic solvations, K Izutsu & T Nakamura. Transient techniques for ion-selective membrane studies, E Lindner et al. Status of the reference method for the determination of ionized Ca in serum, plasma and whole blood, A H J Maas et al. Cu/II/electrode function dependance on the membrane composition for selenide-based all solid-state copper ion-selective electrodes, M Neshkova. Polymer ion-selective membrane optimisation for solid-state sensors, J M Slater. Potential dynamics of crystalline ion-selective electrodes, Yu G Vlasov & Yu E Ermolenko. Subject index.