hi mandya,
the basic difference is that with an action step you can call an external code module (DLL, ActiveX component, LabbVIEW and so on -- it depends how you set the module adapter of the action step). The statement step does not have this functionality, it is just for manipulation of variables or for access to the teststand API. If you use the action step with the none adapter then you basically have the same functionality, that means the statement step is the action step without the ability to call a module.
ciao
w.
