Williams say it is "incredibly painful" to have failed to get their car ready in time to take part in the first Formula 1 pre-season test this week.
Team principal James Vowles said on Wednesday that the team's decision to withdraw from the test in Spain was "the result of our determination to push the limits of performance under the new regulations".
"It clearly wasn't our plan, and it's incredibly painful," he added.
"If you want to transform at speed, you need to find the pain points and put them right very quickly, which is exactly what we're doing."
Vowles took over at Williams in 2023 and has been leading owner Dorilton Capital's attempt to turn the team back into frontrunners, after years of poor performance and what Vowles has described as underinvestment.
He described the car's failure to pass one of its mandatory crash tests, in the run-up to last week's decision to pull out of the Barcelona test, as "a blip in the grand scheme of things".
The car has now passed all its impact tests, Vowles added, and drivers Carlos Sainz and Alex Albon "stand shoulder to shoulder with me".
"They're clearly, as I am, disappointed," said Vowles.
"They want to be out there testing the car, and whilst they're in our driver and loop simulator in tandem now, to increase that programme, it isn't the same."
Vowles said the main problem was that the factory was unable to cope with the demand put on it by the car build process.
"It's more of an output than anything else, of pushing not just the boundaries of design but the boundaries of just simply how many components can be pushed through the factory in a very short space of time," said Vowles.
"The car we've built is about three times more complicated than anything we have put through our business beforehand.
"So, to put that in perspective, it means the amount of load going through our system is about three times what it used to be.
"And we started falling a little bit behind and late on parts. There are compromises you can make as a result of it.
"In addition to that, we have absolutely pushed the boundaries of what we're doing in certain areas. And one of those is in certain corresponding tests that go with it."
Vowles did not directly answer a question as to whether the car was significantly over the minimum weight limit, saying it was impossible to respond to "murmurings in the media" because it was not possible to know the answer until the car was assembled.
However, he said the team were on target to make it to the second pre-season test, which takes place in Bahrain on 11-13 February.
He also said he had "experts and specialists" working with Williams to try to improve their factory operations.

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