Williams has become the first team to launch its 2016 car after releasing images of its new FW38 on Friday morning.
The team had promised the 2016 car would be "significantly different" at the end of last year, and although the car still has a familiar nose, the sidepods and rear appear to have been reworked. More updates are scheduled to come ahead of the first race and the team said the car launched on Friday is "by no means the final product".
Once again, the Williams will be powered by a Mercedes engine, which has been instrumental in the team's two third-place finishes in the constructors' championship over the last two years. The FW38 retains its Martini sponsorship and iconic livery for the new season and will be driven for the first time at pre-season testing on Monday.
"We have a very stable team going into 2016, with Felipe [Massa] and Valtteri [Bottas] teaming up for a third successive season," team principal Sir Frank Williams said. "They work well together and both have the ideal blend of speed and consistency. Our technical team has also remained very consistent which will be to our advantage and we have some of the best engineering minds on the grid at our disposal.
"We have a busy couple of weeks of testing coming up to learn more about our package and to refine the car ahead of the first race. We will have to wait until Melbourne to find out exactly where we stand in the pecking order but I'm confident that our hard work over the winter will stand us in good stead."
Deputy team principal Claire Williams added: "2016 promises to be a very competitive year in Formula One and there will be a number of strong teams who have us in their sights. We are confident that we have made a step forward over the winter and that the FW38 will build on the strengths of the FW37 and address some of its weaknesses. We started design work on the car earlier than normal and hopefully this extra development time will stand us in good stead.
"The car we are launching today is by no means the final product. We are already planning updates for Melbourne and will be pushing for constant improvements over the course of the season. Williams enters 2016 in a strong place. We have a great team of people and over the past two years we have started to regain our competitive edge. Now we need to build on that and take this team back to where we all want it to be."
Valtteri Bottas will debut the car at the Circuit de Catalunya before handing over to team-mate Felipe Massa in the second half of the week.