Williams' head of vehicle performance Rob Smedley is confident that the squad is making progress in low-speed corner and wet weather conditions, two aspects where the outfit has struggled across recent years.
Williams has been among the outfits to challenge Mercedes since Formula 1's new regulations were introduced for 2014, but the team has struggled on some circuits, such as Monaco, as well as when rain strikes, as was demonstrated by its lack of pace when wet weather affected the British Grand Prix.
While Williams is wary that Felipe Massa's pace-setting time during second practice for the Russian Grand Prix came in a session where only eight drivers posted a lap, Smedley is pleased with the progress which has been made in this department.
"We had planned to run in the wet but we had a strange situation this afternoon in that half of the circuit was much wetter than the other half which made most of the tests null and void," said Smedley.
"We have been working on the wet set-up of the car and so wanted to get out at the end of FP2 to see the progress we have made. In a similar vein to our low speed corner work in Singapore, we seem to be making progress.
"We got through all of the bits and pieces we wanted to get through in terms of control systems and power unit set-up, and we have to go into tomorrow with a good plan for FP3 to get the car set-up for qualifying and the race."