You know the narrative. They are two of Formula 1's most successful teams - with 17 constructors' and 19 drivers' championships between them - yet neither have won the teams' title this century, and haven't won a race since 2012.
Twenty years ago, McLaren scored their eighth constructors' title, while Williams had just claimed back-to-back crowns in 1996 and '97. But the world has changed since then, old certainties have been washed away and new business models required.
Both have diversified their businesses, McLaren with their Automotive and Applied Technologies divisions, Williams with Advanced Engineering.