Car Security Awards 2008 - How the tests are done
The tests, carried out by experts at motor insurance research centre Thatcham, cover two main areas: 'theft from' a car and 'theft of' a car. Top marks show as a double five-star rating.
Everything from ignition and steering column locks to the windows are considered, with each feature given a weighted score.
The cars on these pages are the top three in each car category, so the differences between them are slender.