A catch-all tag for either unfinished works in progress that lead to a final production work, or ancillary reference materials used in the production of a work. This is almost always [[official art]], with the exception of production work of individual doujin [[animated|animations]].

This includes [[unfinished]] and [[making-of]] materials such as:

* works drawn on [[animation paper]] to be used as with a [[peg bar]], or featuring [[trim marks]] for later editing
* [[color trace]]s
* [[partially colored]] art (when a reference or a piece of pre-production artwork)
* [[key frame]]s
* [[animatic]]s (very rough pre-production [[animated|animations]])
* [[photo (medium)|]]s or [[scan]]s of physical [[cel]]s used in a traditionally animated work

As well as production references such as:

* [[storyboard]]s
* [[reference sheet]]s
* [[information sheet]]s
* [[production note]]s
* [[color guide]]s
* official [[height chart]]s and [[costume chart]]s
* [[promotional art]] used in the advertisement of a work
production art