ESDU 78019 gives a correlation of computed results using a method that allows iteratively for the displacement effects of the boundary layer and wake. It is found that by plotting the profile drag of the body as a fraction (the form factor) of the skin friction on a flat plate with the same transition position at the same Reynolds and Mach numbers@ the data can be correlated and shown graphically simply as a function of body geometry parameters for a datum condition of transition at the nose@ zero Mach number and fixed Reynolds number. Correction factors@ also given graphically@ correct the data for different transition positions and Mach numbers from datum. To assist in obtaining the value of profile drag@ additional graphs give the flat plate mean skin friction for an appropriate range of transition positions@ Reynolds numbers and Mach numbers. The method of correlating the data has been found to be accurate within 1 per cent for a range of body geometry and flow conditions. The computational method itself was found to agree within 5 per cent with a limited number of reliable experimental data available in the literature. A worked example illustrates the use of the data. ESDU 77028 gives@ for a range of forebody and afterbody shapes@ the geometry parameters required for the use of the correlation. Although the method is relatively simple to apply@ it is fairly time consuming to evaluate by hand due to the need to determine some second-order effects of body geometry. Analytic equations were therefore developed using the original database. They are easily programmed and give a correlation only marginally worse than the graphical method and@ moreover@ they extend the method to cover a greater range of transition positions. It is tentatively suggested the method may be applied to bodies of smooth non-circular cross section.