We need for articles to pass by an editor before getting published. Some pages need to pass by two different people. This is beyond the contributor/author/editor roles in the Joomla core, I think, because edits to existing pages need to be held for approval, during which time the original page needs to remain live.
Is this possible in Joomla 3.x?
An extension like this may help you
and other options are also ther use 3rd party software like processmaker and integrate it in JOOMLA in iframe and LDAP to verify users.
open source version of processmaker is available and free to use