Former motor racing world champions Williams have targeted next month's Spanish Grand Prix for a significant step forward with their car after failing to score a point in the first two races of the Formula One season.
Williams won at Barcelona's Circuit de Catalunya, the first race of the European season, last year with Venezuelan Pastor Maldonado.
In a preview of Sunday's Chinese Grand Prix, which is followed next week by the Bahrain Grand Prix, technical director Mike Coughlan says the team has gone through the data and now have a better understanding of where they need to improve.
Coughlan says the conditions in China, with cooler temperatures, should suit the Williams team better than in Australia and Malaysia although the circuit surface was quite hard on tyres.
