Execution hierarchy of firing for a trigger?

could you please tell me the execution heirarchy for trigger

e.g. when you have a WHEN-NEW-ITEM-INSTANCE :
if you create a trigger on item, block and form-level, then only the ITEM-Level will start. If you use the exec-hierarchy Override.
If all trigger use After, then the FORM, BLOCK and ITEM starts in that sequence.
If all trigger use Before, then the ITEM, BLOCK and FORM starts in that sequence.
the execution-hierarchy on FORM-Level is ignored, because there is no higher level than FORM

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