I did not see it because it is not in accessing as some of the other methods. I will group all the methods together in property I tried to understand the difference between property:ifAbsent: Basically this is the fact that ifNil: check to see if the property could be computed because metadescribed. I imagine that this is correct. Now when the property cannot be computed this is ok to use ifNil too. Now I have a question how do I make this guy working? self mooseDescription I still do not remember how to access meta stuff in fame. propertyNamed: propertyName ifNil: aBlock "Return the value of the property named propertyName, return nil if the property does not exist" ^self privateState at: propertyName asSymbol ifAbsent: [| property propertyOperator | [propertyOperator := self mooseDescription computableAttributeNamed: propertyName. property := self mmGet: propertyOperator] on: Error do: [:ex | property := nil]. property ifNil: [aBlock value]] On Sep 27, 2008, at 10:55 PM, Tudor Girba wrote: