After the highs of 2012 which included a maiden race win for Pastor Maldonado at the Spanish Grand Prix, the Grove squad have slumped to the back-end of the grid.
Maldonado and rookie team-mate Valtteri Bottas are yet to pick up any points so far this season while the team are also yet to make it through to Q3.
With more than a quarter of the 2013 season already gone, many teams would be tempted to start focusing on next year's car, especially with the rule changes in mind.
However, Williams chief race engineer Xevi Pujolar says they first want to sort out the FW35 before they even think about their 2014 challenger.
"The first priority is to understand the car this year, otherwise how do you know what will work next year," Pujolar said.
"So at the moment our priority is to sort out this car and perform on track."
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