The effect of operating conditions and feed compositions on the yield and quality of reformate and on catalyst deactivation were studied for naphtha reforming over an industrial bimetallic reforming catalyst. The aromatics yield showed a maximum in the pressure range 7-10 bar, while the carbon deposition decreased with increasing pressure. Increasing temperature led to an increase in the yield of aromatics at the expense of reformate. Hydrogen: hydrocarbon ratios (H/HC) in the range 7-12.7 did not show any pronounced effect on reformate or aromatics yield: however, lower H/HC ratios (eg: 3.6), gave decreased aromatics and increased carbon. Quantitative correlations are developed for these observations and mechanistic arguments are presented to explain the results. Feed composition effect studies were carried out by using several naphtha blends having a wide variation in the paraffin, naphthene and aromatics content. At any reforming severity, yields of reformate and aromatics are higher and coke deposition is lower for a naphthene-rich naphtha. The temperature requirement for attaining a particular product quality (RONC) is lower for naphthene-rich naphtha than for paraffin-rich naphtha. Correlations between the reformate octane number and reformate yield have been obtained for different naphtha feed stocks.