ALL aircraft are designed to meet the certification requirements of their country of manufacture and generally they all agree on the same basics.
http://ecfr.gpoaccess.gov/cgi/t/text...1.3.11&idno=14
FAR Part 25 Section 25.201-7 inc. describes what the certification authorities (FAA in this case) want you to demonstrate in stalls.
Manufacturers over the years have over the years, gone to all manner of fandangling to "fix" their aircraft characteristics in order to comply.
It is an interesting forensic study to look at the various types over the last 40-50 years and see what/how the various manufacturers solved their problems.
Nowadays with the very sophisticated and powerfulcomputational fluid dynamics programmes available they can get it more than right first time.
Having said that they still get surprises when the ship actually flys which is what makes it still fun to do.
DP Davies may be quick to tell you that all countries will "have a go" around the edges of the envelope if it suits their own countries manufacturers purposes. Sometimes another country will say "OK but if it is going to fly here we want you to 'do this' or it wont.
"
vis a vis Boing and Scarebus.
And in the old days in OZ the DCA used to make you take the whole aircraft down to its component parts and reassemble it just to be sure the manufacturer hadn't dudded you on a few rivets and bits and pieces of tin here 'n there notwithstanding that you had already paid for a standing army of their staff to follow the aircraft down the production line.
