This technical report gives guidance for the interpretation of dissolved gas analysis (DGA) which has been developed for bushings, in service, where the main insulation (generally paper) is impregnated with mineral insulating oil according to IEC 60296. This technical report is applicable to oil-filled and impregnated paper bushings in service. Until further experience has been gained, the methods should be applied with caution in relation to other materials, e.g. synthetic hydrocarbons based on dodecylbenzene, according to IEC 60867. The indication obtained by the interpretation of a dissolved gas analysis of an oil sample taken out of a bushing should be viewed as a guide and any resulting action should be undertaken with proper engineering judgement.