Presented at the PHOTON2005 Conference, 31 August–4 September, 2005, Warsaw, Poland.In the last year four new parametrizations of the Hadronic Photon
Structure Function at Next to Leading Order have appeared. In this talk,
I briefly review the main features of the three of them: the FFNSCJK, CJK
and AFG.This work has been partially supported by Junta de Andalucia (contract FQM-330), Ministerio de educación y Ciencia (contract FPA2003-09298-c02-01) and the European Community’s Human Potential Programme (contract HPRN-CT-2002-00311 EURIDICE)