Symonds, who last month left his position as Marussia technical consultant started work at Williams today.
He is expected to spend the first part of this week in the factory before heading to Spa to evaluate the team's race weekend operations.
Williams deputy team principal Claire Williams hopes Symonds will be able to have a big impact on the team both in the short and the long-term, but warned he is not seen as a 'magic bullet'.
"Hopefully, [he can] deliver performance to the end of the season on the FW35 and then help with the development of the FW36 for next year," Williams told AUTOSPORT.
"But we don't believe that it is our magic bullet.
"It is naive to think one man can come into an organisation of 550 people and expect to turn the whole thing around within a matter of months."
Williams is still planning to add new developments to its current car after the August break.
As well as building on Pastor Maldonado scoring its first points of 2013 in the recent Hungarian Grand Prix, it is anticipated work on the current car will help the '14 Williams.
"The plan is still to develop the car," said chief race engineer Xevi Pujolar.
"At Spa and Monza, we will have different [low downforce] packages, then in Singapore we will still be trying to improve the car.
"What we are learning with this car with the problems we have had from the beginning of the year will help us with next year's car."
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