Pirelli has confirmed a team's tyre choice prior to a Formula 1 grand prix in 2016 will be kept confidential until a fortnight beforehand.
Following a meeting of the World Motor Sport Council in Paris on Wednesday, the FIA confirmed that from '16 there will be greater freedom when it comes to tyre selection.
With the introduction of the new ultra-soft, there will be five dry compounds available, with three to be selected in advance for each race weekend, rather than the two at present.
From the three, the teams will then select two, with Pirelli revealing the choices within each team could vary, with each driver using a different allocation.
Pirelli has also announced the teams will make their choices within a deadline set by the Italian manufacturer.
The teams will first communicate its choices to the FIA, which will in turn inform Pirelli so they know how many tyres to produce.
The choices for each car will remain secret until two weeks before a race.
If a team does not meet the deadline, the choice will be made for it by the FIA.
Once the choices for each car have been made, the FIA will continue to assign the tyres randomly via a barcode, as is the case currently.