Hi, I am trying to learn how to call/use functions in When/Then that are defined within guvnor tool itself. Here is my example (I know it is really silly example but just trying to stick with something very simple) Function is written as follows: <http://drools.46999.n3.nabble.com/file/n4023759/5-9-2013_11-21-10_AM.jpg> Somehow the invoke method screen does not show my function. <http://drools.46999.n3.nabble.com/file/n4023759/5-9-2013_11-25-54_AM.jpg> Any ideas how to make my function display under the invoke method drop down list. Thank you -- View this message in context: http://drools.46999.n3.nabble.com/understanding-the-use-of-Functions-in-G... Sent from the Drools: User forum mailing list archive at Nabble.com.