Leading In (1/x) and heavy quark corrections in structure functions

I present a calculation of structure functions at leading order which includes an unambiguous inclusion of the leading In(1/x) terms for each power of alpha(s), and also the correct effects due to the mass of the charm and bottom quarks. I compare the results of fits to data to those obtained using conventional NLO in alpha(s) calculations, noting a clear preference for my approach, especially at small x. The predictions for both the charm structure function and F-L (x, Q(2)) using the two approaches are compared, the letter being much more discriminating.