Hi,Now GTInspector can inspect objects that use custom Slot definitions.create a class with he TestSlot (where the ivar lives in the Slot instance and is thus sharedover all instances of A):Object subclass: #Aslots: { #iv => TestSlot }classVariables: { ��}category: ���Playground'InspectA newchange ���iv��� to value (e.g. 5).inspect another ��"A new���==> it should show the value as 5.Thus both reading and writing now is done via the Slot. (as such this require just a very simple change in GT, of course).The GT support of course needs to be improved later:��-> we need a view that shows the object ���as it really is��� (keep in mind, this object has no VM level instance variable!).-> In the view with the slots they should annotated so we see that it is a slot and can easily navigate to the slot definition-> ��� I am sure more will be obvious as soon as we use it.Marcus