MAT is a Web-based metadata quality tool that provides statistical descriptions and visualisations of Dublin Core metadata harvested via the OAI protocol.

• Research Paper: A tool for Metadata Analysis. Working paper, Feb 2008. David M. Nichols, Chu-Hsiang Chan, David Bainbridge, Dana McKay and Michael B. Twidale.
• Research Paper: Experiences in Deploying Metadata Analysis Tools for Institutional Repositories. David M. Nichols, Gordon W. Paynter, Chu-Hsiang Chan, David Bainbridge, Dana Mckay, Michael B. Twidale and Ann Blandford. 2008.
• Presentation: Experiences in Deploying Public Metadata Analysis Tools. David Nichols. 2009.

MAT is available as a Greenstone 3 extension. Check out the source code into the ext folder of a greenstone 3 installation.

cd greenstone3/ext
svn co http://svn.greenstone.org/gs3-extensions/mat/trunk/src mat
cd mat
ant install

Check that the greenstone3/web/WEB-INF/web.xml file contains the following two sections:

<servlet>
 <servlet-name>mat</servlet-name>
 <description>mat</description>
 <servlet-class>org.greenstone.mat.servlet.MatServlet</servlet-class>
</servlet>

<servlet-mapping>
 <servlet-name>mat</servlet-name>
 <url-pattern>/mat</url-pattern>
</servlet-mapping>

Restart the tomcat server, then access MAT at localhost:8383:/greenstone3/mat

Note, I have just tried this and it didn't seem to be working properly.