Cochrane reviews are published in full online in the Cochrane Database of Systematic Reviews (CDSR), which is a core component of The Cochrane Library. The Cochrane Library is published by Wiley-Blackwell on the internet (www.thecochranelibrary.com) and on CD-ROM, and is available free at the point of use in some countries thanks to national licences and free access provided by Wiley-Blackwell in the most resource-poor settings. Elsewhere it is subscription based, or pay-per-view. In addition to CDSR, The Cochrane Library contains several other sources of knowledge, listed in Box 1.1.b.
The CDSR is published four times a year, each time with new reviews and updates of existing reviews. Issue 1, 2008 of CDSR contained more than 3000 Cochrane reviews and over 1700 protocols for reviews in progress.
The CDSR is published twelve times a year, each time with new reviews and updates of existing reviews. Issue 3, 2011 of CDSR (March 2011) contained more than 4500 Cochrane reviews and 2000 protocols for reviews in progress.