At Ferrari's private Fiorano (Italy) track, test driver Luca Badoer - to today hand over to Michael Schumacher - kicked off work ahead of Monaco.
The only other Tuesday action centred on the rarely used Vallelunga venue, also in Italy.
Grove-based Williams, running Antonio Pizzonia and - about a second slower - part time tester Andy Priaulx on Tuesday, intend a three day test there.
"(Vallelunga) bears the closest resemblance to Monaco," said test manager Tim Newton, who added that Williams is new to the circuit.
To commence on Wednesday, many teams - like McLaren, Toyota, Sauber and Renault - have travelled to Paul Ricard (France). -GMM