Ferrari team principal Stefano Domenicali believes Formula 1 must do better in the future when it comes to making regulation changes, after claiming this year's new car rules aimed to boost overtaking have been a failure.
A major aerodynamic revamp was introduced at the start of this year with a view to improve the racing and making passing easier.
However, although the rules have shaken up the grid and allowed fresh winners, the on-track battles have not been hugely improved - and overtaking is still as difficult as it has been in the past.
Domenicali believes that the lessons of this year are proof that when it comes to making changes in the future, it is important more effort is made to ensure that they are a success.
"I think the 2009 regulations were changed in order to have better overtaking, that was the main principle," Domenicali told the Shell.com/Ferrari website in a video interview.
"I have to say that if you look at the races, that objective was not really achieved so far. So that means that when there is a change of regulation, before doing something it's very important we really need to make sure that what we want to achieve in terms of objectives is really achieved.
"The objective that was achieved was the fact that we had a different grid, different cars were more competitive and this is for sure the only thing I can say on the new regulation."