True, but all too oftern have i seen mistakes made because people do not fully understand what things mean especially when it comes to timber frame, which uses different construction principles to that of brick and block constructions.
The area that is insulated in timber frame is the stud void. the external wall cavity is the cavity between the timber frame and the cladding.
Sorry if that comes over a bit preachy, or like i am a bit of a keyboard warrior i don't mean to sound that way
BTW i am a timber frame building inspector, and stumbled across this site whilst trawling the web the other day!