With several teams expecting upgrades to their cars at the Spanish Grand Prix, Williams driver Valtteri Bottas believes the race at the Circuit de Catalunya will play a decisive role in deciding the outcome of the 2014 season.
Williams are one of the teams that expect a major upgrade to be available in Barcelona, and Bottas is confident that his team will continue their strong start to the season in Catalunya.
"Yes, I think it's going to be an important weekend," the Finn told Autosport.
"It's going to give some direction of how the rest of the season is going to be.
"If we can make some steps forward, it would be really nice, but it is going to be interesting.
"We know it's difficult because everyone will bring more updates, it's just a matter of whose work and whose don't.
"The positive thing is that most of the parts we brought [to China] worked and we saw an improvement, so we are hoping to make an even bigger step in Barcelona."
Even though Williams perhaps haven't scored as many points as their pace warranted, Bottas has finished in the top 10 in all four races so far this season.
Despite the massive upturn in form from the disappointing 2013 season, Bottas added that the Wantage team can continue to improve as the season progresses.
"It's still positive to be consistently in the points but you always want more," he said.
"We just need to keep pushing, keep solving the problems and try again next time."