I will try to answer the questions as best I can and hopefully someone else will chime in: 1) Drools use to be the former name of JBoss Rules. I am assuming they did not see the need to re-package everything once it went under the JBoss umbrella. This is similar to how Hibernate works. 2) .drl files are the standard syntax and meta language for the rules files. It is best if you read Section 3 of the JBoss rules manual at: http://labs.jboss.com/file-access/default/members/jbossrules/freezone/doc... 3) Your best bet to validate the rules is to use the Eclipse plugin. See the following: http://labs.jboss.com/file-access/default/members/jbossrules/freezone/doc... Hope that helps! Ron On 4/13/07, Zully Yineth Romero Albarracin <zuyiro(a)gmail.com&gt; wrote: