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The current knowledge of thermodynamic properties of ordinary water substance is summarized in a condensed form of a set of skeleton steam tables, where the most probable values with the reliabilities on specific volume and enthalpy are provided in the range of temperatures from 273 to 1073 K and pressures from 101.325 kPa to 1 GPa and at the saturation state from the triple point to the critical point. These tables have been accepted as the lAPS Skeleton Tables 1985 for the Thermodynamic Properties of Ordinary Water Substance (IST-85) by the International Association for the Properties of Steam (lAPS). The former International Skeleton Steam Tables, October 1963 (1ST-63), have been withdrawn by lAPS. About 17 000 experimental thermodynamic data were assessed and classified previously by Working Group 1 of lAPS. About 10 000 experimental data were collected and evaluated in detail and especially about 7000 specific-volume data among them were critically analyzed with respect to their errors using the statistical method originally developed at Keio University by the first three authors. As a result, specificvolume and enthalpy values with associated reliabilities were determined at 1455 grid points of24 isotherms and 61 isobars in the single-fluid phase state and at 54 temperatures along the saturation curve. The background, analytical procedure, and reliability of IST-85 i:tS wdl as tlit: asst:sslIlt:ut uf tilt: t:xisling t:xpt:rimt:ntal data and equations of state are also discussed in this paper.