Williams will decide early next year if they are to continue their partnership with engine-builder BMW, according to team boss Sir Frank Williams.
The Didcot-based team were chosen by BMW to help the German car manufacturer return to Formula One in 2000 and have steadily improved since then.
But the original partnership deal ends in 2004 and some have suggested BMW may opt to go it alone as a Formula One constructor.
Williams revealed the decision on who will power his cars beyond 2004 will be made in mid-January, although he has no doubts BMW will eventually be a success.
He said: "The people of BMW are one of the most intelligent and business-minded with whom I've ever been working together. They use the budget extremely efficiently.
"Since the executive directors have decided to join the Formula 1 they have been working at 100 per cent.
"Continuity is as important as optimal communication. Especially since we're located in Great Britain, BMW in Munich and our tyre partner Michelin in Clermont-Ferrand. It is very important that all persons involved work together as long as possible."
PA