Mercedes is set to discover if it will face any sanctions over its tyre test with Pirelli when the FIA's International Tribunal meets to discuss the matter in Paris today [Thursday].
The Tribunal was due to start at 9.30am local time, with Mercedes team boss Ross Brawn and Pirelli's Paul Hembery amongst those set to face questions from the governing body as it seeks to discover if the test was in breach of the sport's current regulations.
While in-season testing is currently banned, Mercedes insists it was acting with permission from the FIA, although the governing body has suggested that things weren't that simple when it came to the issue of whether the test could take place or not.
But how did the issue arise and how did the story develop?
Just before the Monaco Grand Prix, news breaks of a three day test
carried out by Mercedes in Barcelona to help Pirelli with tyre development work.
Mercedes say the FIA was aware of the test
and that it didn't try to hide anything.
Pirelli also insists that the test was legal
and that no rules have been broken.
After a protest is lodged by Red Bull and Ferrari, Rosberg wins in Monte Carlo. The result stands, but stewards elect to send the matter to the FIA
with the suggestion that it could go before the International Tribunal.
The governing body reacts by hinting at sanctions
being taken against Mercedes for taking part in the test.
Red Bull say the Mercedes test was underhand
and a breach of the regulations.