I was reviewing the Tags recently - came across the Update, Upgrade and Migration, and Migrate.
Upgrade has no entry yet.
Update has the following excerpt:
This tag is for questions about updating within the same Joomla major version, or upgrading from Joomla 2.5 to 3. For questions about going from Joomla 1.5 to 2.5+, please use the Migration tag.
This tag is for questions regarding migration from Joomla 1.5 to Joomla 2.5 or 3.x.
Migrate: emtpy yet.
I can't understand this dissociation.
Upgrade should still describe any major advancement in the software and the process of replacing it with a new branch release, so 2.5 to 3 is an upgrade and it's wrong to use the update tag for this.
Migration/migrate could be synonyms.
And maybe because there can be many types of migration, like a migration from another CMS or database to Joomla, it might make sense to distinguish the J1.5 to newer Joomla migration, to something like Joomla1.x-Migration.
Just a few thoughts...