a Well, then the optimal way is to Pre-Evaluate it in the code and assert that variable as a Fact. But I dont think this is great from a declarative programming point of view. Actually in decision table, a condition will be repeated "Row" number of times. So in the condition if an eval() is used; that eval is used "Row" number of times (though prasctically dependson other conditions, if at runtime how many times the eval will be used), but still it is inefficient. I think it is important to maintain discipline when writing declarative staements, and should try and rely less on the code for efficient solutions. I guess I have no choice in this case. Thanks for you reply.