First published as a CD-ROM in 1996, the database World Data on Education has regularly been improved and expanded using the information included in the National Reports on the Development of Education, supplemented with data from other sources. Five editions (out of print) have been produced until 2003. The sixth edition 2006/07 (out of print) contains detailed and systematized information on education systems of 161 countries worldwide, with a particular emphasis on curricula and curriculum development processes. The database, which contains selected links to a range of official information sources on education, can also be accessed online. Each individual profile of national education system can be downloaded in the pdf format.