Hi, got a few questions about binding variables, hope someone can help out, thanks. 1. Does binding actually cache the result for the RHS? example: rule "no binding" when c : MyClass(member1 != member2) then c.somemethod(imp.getMember1()); end rule "with binding" when c : MyClass(m : member1, member1 != member2) then c.somemethod(m); end Does "no binding" call getMember1() twice while "with binding" calls getMember1() once and cache the result to m? Or are both the same? 2. Is the practice to bind before or after? example rule "binding after" when c : MyClass(member1 != member2, m : member1) then c.somemethod(m); end Is there any difference between "with binding" and "binding after"? 3. Is bind and use in the LHS any better? example rule "binding and use" when c : MyClass(m : member1, m != member2) then c.somemethod(m); end Is there any difference between "with binding" and "binding and use"? 4. Why binding with constraint is not recommended? example rule "binding with constraint" when c : MyClass(m : member1 != member2) then c.somemethod(m); end In the expert manual, Drools 5.5.0 section 4.8.3.3.5. Binding variables, it said // Not recommended Person( $age : age * 2 < 100 ) // Recommended (separates bindings and constraint expressions) Person( age * 2 < 100, $age : age ) Although I know $age : age * 2 < 100 is binding $age to age *ONLY*, while $age : (age * 2 < 100) is binding $age to the result of (age * 2 < 100). Is the recommendation only about this safety precaution? Thank you so much for answering. -- View this message in context: http://drools.46999.n3.nabble.com/Binding-mysteries-tp4026999.html Sent from the Drools: User forum mailing list archive at Nabble.com.