JavaScript is an imperative language and Drools propose a declarative approach. You should analyze the business logic included in that js file and analyze how to translate that logically to business rules. Then you should learn about the DRL syntax and how is the rule engine behavior to fully understand what you are doing. You are not only changing the language you are also changing how the business logic will be expressed and executed. Cheers 2011/12/20 G S <gshrestha1972(a)gmail.com&gt;: --  - CTO @ http://www.plugtree.com  - MyJourney @ http://salaboy.wordpress.com  - Co-Founder @ http://www.jugargentina.org  - Co-Founder @ http://www.jbug.com.ar  - Salatino "Salaboy" Mauricio -

First of all you need to learn the basics about drools: http://docs.jboss.org/drools/release/5.4.0.Beta1/droolsjbpm-introduction-... Then, you will need to learn about DRL syntax and how to use drools' engine: http://docs.jboss.org/drools/release/5.4.0.Beta1/drools-expert-docs/html_... And finally, since JS is a client side language and drools (typically) runs in server side, you will need to choose one of the existing integration techniques: http://docs.jboss.org/drools/release/5.4.0.Beta1/drools-expert-docs/html_... As you can see, moving from JS to drools it is not a one step solution :) Best Regards, XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Esteban Aliverti - Developer @ http://www.plugtree.com - Blog @ http://ilesteban.wordpress.com 2011/12/20 G S <gshrestha1972(a)gmail.com&gt;