Hi, For blocks, we now have the correct model to destinguish âblock creationâ from âblock executionâ: 1) put a link on the block node, it will be called when the block definition (creation) is executed. e.g. when you put a before link on the block in this method, it will be called when you execute the method: TT>>method ^[1 + 2]. 2) put a link on the *body* of the block (the sequence of statements), it will be called when the block *executes*. For the example, it would not be called when executing âTT new methodâ, but only when you do âTT new method valueâ. Test: testBeforeBlockSequenceNoValue | sequence link | sequence := (ReflectivityExamples >> #exampleBlockNoValue) ast statements first value body. self assert: sequence isSequence. link := MetaLink new metaObject: self; selector: #tagExec. sequence link: link. self assert: sequence hasMetalinkBefore. self assert: (ReflectivityExamples >> #exampleBlockNoValue) class = ReflectiveMethod. self assert: tag isNil. ReflectivityExamples new exampleBlockNoValue. self assert: tag isNil. ReflectivityExamples new exampleBlockNoValue value. self assert: tag = 'yes'. self assert: (ReflectivityExamples >> #exampleBlockNoValue) class = CompiledMethod. link uninstall. ReflectivityExamples recompile: #exampleBlockNoValue Marcus