Hi Mark, Thanks for your reply. I tried migrating rules from 5.0 to 5.1 at first. For this, I just replaced drools-core and drools-api jar from 5.0 to 5.1. After doing replacement, I found following error while building the app : KnowledgeAgentImpl.workflowOrRuleChanged cannot be resolved This was kind of flag for notifying that KB has to be rebuilt. Any idea how to achieve same thing in 5.1 APIs ? Also, is there is any documentation/article/s about migration from 5.0 to 5.1 ? Thanks, Swapnil Sawant

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