Pattern descriptions are updated individually in response to new ideas, suggestions or changes in society. They are all updated, and their Internet links are refreshed, when a new edition of the books is produced: every few years. Archive copies of each version are retained, as described here, where there are also details of the link addressing scheme: the URLs. The URL addressing scheme was changed from section numbers to words in Patterns of Power: Edition 3.
The book Patterns of Power: Edition 2 contains a complete copy of the pattern descriptions which were current at the time of its publication in August 2014. They were updated in Edition 3 and further revised in Edition 3a. Each description is labelled as to which edition it belongs to.
Links from Edition 2, and from The Rough Guide, are still supported – with links to the appropriate archive material and by directing readers to the new Contents pages for access to current versions. Link redirection is maintained for readers of the first Overview book. Some new sections and sub-sections have been added since that time, though, so the Edition 3 books have access to more material.
The information management objectives are to ensure that readers know which version they are reading and to ensure that archived copies remain available so that citations can be made to a specific version – with a guarantee that the cited text will not subsequently change.