The policy is the first major change under new head coach Charles van Commenee
UK Athletics has revealed new selection criteria for the Berlin IAAF World Championships in August 2009.
Athletes who gain one "A" standard during the qualification period and win their event at the World Trials and UK Championships will be selected.
Priority in terms of selection will go to individuals and relay squads deemed capable of winning a medal or a top-eight finish.
It will be the first selection by new UK head coach, Charles van Commenee.
Selection standards are in line with IAAF standards, with the exception of the walks and marathon, in which UKA employs tougher standards to ensure parity with other disciplines.
The qualification period is from 1 April until 26 July.
The UKA has also accepted an invitation on behalf of the Norwich Union GB men and women's 4x400m teams to take part in the European Indoor Championships in Turin.
The remainder of the squad will see individuals deemed capable of either winning a medal or finishing in the top six in Turin chosen.
UKA have set their own qualifying standards which began on 1 December and finish on 22 February next year, which athletes must achieve.
Meanwhile, Kelly Sotherton has accepted an invitation to compete in the pentathlon in Italy.
Sotherton - who finished fourth at the Olympic Games in Beijing this summer - was beaten to the gold medal by Carolina Kluft on the last two occasions.
The 32-year-old may face current Olympic gold medallist Natalya Dobrynska, if the Ukrainian decides to enter.
Sotherton said: "2008 was a tough year but I'm looking forward to getting back into competition at the Indoors.
"With the European Indoor Championships in March and the World Championships in August I have plenty to focus on and I am looking forward to it."