While creating new documents may require much resources, maintaining documents is typically requires the larger amount of resources. Therefore documentation needs to be easy to maintain.

Aspects

Updatability
Documentation needs to make it easy for authors to add to and update existing documents.
Extendability
Documentation needs to be easily extendable with new content.
Evolvability
Documentation, especially in the context of team collaboration, is never complete and finished. Documentation should therefore embrace this fact instead of fighting it. Supporting an iterative and collaborative work style is therefore required.