Here are some of the features and notes about Pm Wiki's design decisions. Many of these derive directly from the PmWikiPhilosophy and lots of discussion on the mailing lists.
- PmWiki:FlatFileAdvantages - why Pm Wiki uses flat files to store pages instead of an SQL database
- PmWiki:HierarchicalGroups - why Pm Wiki doesn't support nested groups
- PmWiki:PageLocking - how Pm Wiki works without locking pages (see also simultaneous edits)
- PmWiki:SearchImprovements - why Pm Wiki has a native search engine
- PmWiki:FilePermissions - some information about Pm Wiki's file permission settings