Originally Posted by Hazelnuts39
Actually, these things are governed by airworthiness requirements, e.g.:
FAR/JAR 25.207 Stall warning (a)Stall warning with sufficient margin to prevent inadvertent stalling (...) must be clear and distinctive to the pilot in straight and turning flight.
They may be governed by AW Requirements, but the actual alpha and the interpretation of
sufficient margin (which is what the question was getting at) is established first during design and subsequently by flight test (engineers/test pilots).
If these are found to be insufficient in any way, then discussion and resolution/agreement by both parties would be expected. But
'sufficient margin' indicates we are in an area of subjective judgement rather than predicated figures.