2011 Auto Bild All Season Tire Test

What exactly are summer tires and winter tires. Surely tire manufacturers don't expect us to change tires twice a year.

I can't find this test on autobild. Do you have the exact link?

Bought the Goodyear Vector 4Seasons recently, due to living down single track country lanes, which are wet & muddy & having a couple of accidents purely down to lack of grip. these tires are FANTASTIC & have made an incredible difference to grip, handling & stopping, totally transforming my drive, even though I already had decent tires before.

where is other big brands such as michelin, pirelli, nokian, bridgestone?

The Hankook and Goodyear tires have usually held the top two position in past tests. Hence surprised to see the Vredestein in 1st place in the 2011 test. What car/ tire size did they use in the 2011 test? as this might be one of the things affecting the rankings. Strange the Hankook has the best rolling resistance yet comfort and noise scores aren't better(?) Personally I would still opt for Hankook or Goodyear over 
Vredestein as their rankings have been more consistent over the years.