Question: I need a word to describe a review that has been made on a review.

The review itself I will call a "review", but if someone reviews the reviews, what can I call this? I can't call it a review as well as that would be confusing.

I need a short understandable word for it. Any ideas?

Answer: 
A review of a review is still just a *review*. 

You might risk calling it a *meta-review*, but understand that you would thereby put yourself at some small risk of being misunderstood.
You might use terms like *[survey](http://en.wiktionary.org/wiki/survey#Noun)*, *[overview](http://en.wiktionary.org/wiki/overview#Noun)*, *[composite](http://en.wiktionary.org/wiki/composite#Noun)*, and *[compilation](http://en.wiktionary.org/wiki/compilation#Noun)*, if the idea is that the meta-review will be combining information from other reviews. If, on the other hand, the meta-review is intended to assess the quality of an earlier review, call it a *[reevaluation](http://en.wiktionary.org/wiki/reevaluation#Noun)* (“A second or subsequent evaluation or rating”) or *[reassessment](http://en.wiktionary.org/wiki/reassessment)* (“a second or subsequent assessment”).

Also see terminology mentioned in cochrane-net's [Combining studies](http://www.cochrane-net.org/openlearning/html/mod12-2.htm) webpage, and in wikipedia's [Meta analysis](http://en.wikipedia.org/wiki/Meta-analysis) article.