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I investigate what a direct measurement of the longitudinal structurefunction F_L(x,Q^2) could teach us about the structure of the proton and thebest way in which to use perturbative QCD for structure functions. I assumeHERA running at a lowered beam energy for approximately 4-5 months and examinehow well the measurement could distinguish between different theoreticalapproaches. I conclude that such a measurement would provide useful informationon how to calculate structure functions and parton distributions at small x.Comment: To be published in the proceedings of the Ringberg Workshop on "New  Trends in HERA Physics 2005

IMPORTANCE OF A MEASUREMENT OF FL (X, Q2) AT HERA

IMPORTANCE OF A MEASUREMENT OF F_L (X, Q²) AT HERA