A guide for enhancing high-strain-rate superplasticity (HSRS) in oxide ceramics are drawn from existing knowledge for superplasticity and relating phenomena. A trial following the guide led to enhanced HSRS at about 10(-2) s(-1) and a maximum tensile ductility of 300-600% in monolithic tetragonal ZrO2 doped or co-doped with Al2O3, MgO, Mn3O4 and TiO2. The trial also led to HSRS at 10(-1)-10(0) s(-1) and a maximum tensile ductility of 600-2500% in a dual-phase composite consisting of tetragonal ZrO2 and MgO.Al2O3-spinel and in a tri-phase composite consisting of tetragonal ZrO2, MgO.Al2O3-spinel and alpha-alumina. Post-deformation microstructures suggest that certain secondary phases may be effective in suppressing cavitation damage and thereby enhancing HSRS.