If they publish in a Hybrid open access journal, authors or their funders pay a subscription journal a publication fee to make their individual article open access. The other articles in such hybrid journals are either made available after a delay or remain available only by subscription. Most traditional publishers (including Wiley-Blackwell, Oxford University Press, and Springer Science+Business Media) have already introduced such a hybrid option, and more are following. The fraction of the authors of a hybrid open access journal that makes use of its open access option can, however, be small. It also remains unclear whether this is practical in fields outside the sciences, where there is much less availability of outside funding. In 2006, several funding agencies, including the Wellcome Trust and several divisions of the Research Councils in the UK announced the availability of extra funding to their grantees for such open access journal publication fees.