The Laplace domain solution of three coupled partial differential equations descriptive of the mass transfer phenomena that occur within a Support Coated Open Tubular （SCOT） Column is used to derive an expression for the Height Equivalent to a Theoretical Plate (HETP) for any SCOT Column. The final correlation is developed by calculating the theoretical second moment about the mean for a chromatogram and using this result in traditional chromatographic theory to construct the desired expression. Typical experimental values and those calculated from the correlation derived in this work are presented as a verification of the proposed dispersion model employed to describe the mass transfer phenomena within this dynamic system.