This International Standard is applicable to high-Tc Josephson junctions. It specifies terms, definitions, symbols and the measurement and estimation method for normal state resistance (Rn) and intrinsic critical current (Ici). An Rn value represents the resistance of a weak link between two HTSs when they are in a normal-conducting state. An Ici value represents the maximum direct current without a voltage drop between two HTSs in a superconducting state when there is no noise-rounding effect on a U-I characteristic curve. The weak link can be formed with step-edge, ramp-edge or other structures. The IciRn product gives an important parameter for designing superconductor devices.