[CMOTD]

The approach taken by NASCAR worked because there were only 3 manufacturers involved and the aim appears to have been to pretty much equalise the performance of the cars between the 3 manufacturers.
 

Very true and NASCAR is all the better for it. However, the general approach is the right one, before everybody spends umpty millions on a radical new car then the sanctioning body pays to test out the basic principles of the proposed rules. F1 could have commissioned a spec car with the new underbody to test the rules before finalising things and their failure to allow any significant testing was sheer lunacy.

Adrian Newey has certainly done the best job but the Red Bull cars also bounce as Perez has admitted, just not as badly as the others.

BTCC has also successfully introduced a new hybrid system this year and they followed the same route as NASCAR. Speedworks and Cosworth were commissioned to build a prototype car which was extensively tested for over a year and even tried out in race conditions last September.