"The remainder were fundamentally one-stops, although some were wet and some were interrupted by red flags. The problem with that is, with the low degradation, you didn't have a lot of what I consider 'racing', a lot of cars able to do different tactical options.
"Really you were cornered on where you could go. Pirelli had to build a tyre for 2017 that was robust to what was one of the most significant aerodynamic changes we have ever gone through.
"They accomplished that goal, but the tyres were too robust on their first attempt. Really, what they are trying to create now is better racing, more tactical options, more abilities for two-stops and a range of compounds that suit more circuits."
Work for 2018 started in early 2017, before Pirelli embarked on an extensive 25-day testing programme, in order to come to a final conclusion at the post-Abu Dhabi Grand Prix test.