According to Williams Deputy Principal Claire Williams, they failed to reach their targets in 2016 after finishing fifth on the Constructors’ Championship.
The Grove-based outfit suffered their worst season since the regulation changes in 2014 as they failed pip Force India on the Championship table.
Williams refused to pinpoint a direct cause of their dismal 2016 campaign but explained that there were a number of issues that need attention next season.
However, looking ahead to the future, Williams is optimistic that they can regroup and put in solid performances in 2017, with rookie driver Lance Stroll stepping in and replacing Felipe Massa.
"I don’t think we’ve delivered where we needed to deliver this year, across a number of key elements," she said.
"I’m not going to go into detail on the areas of weakness we have in the team this year, but we know where those weaknesses are and we just need to make sure that we improve upon those areas over the winter.
"But Force India have done a fantastic job … they have just done a better job than we have and we need to look into that. We don’t want to finish fifth in the world championship.
“It’s a bit of a disappointment having come third in two consecutive seasons, in 2014 and 2015. We just need to do a better job."
Stroll, though, might not be partnering Valtteri Bottas next season as the Finn is linked with the vacant Mercedes seat. Williams are determined to keep him.