# Is there a sensory difference?

Suppose: No sensory difference between the products has been found. The question is whether the search for differences has been extensive enough. This depends on the so-called ‘statistical power’ of the test used. The higher this ‘power’ the more extensive the search for differences has been.

You may be familiar with the traditional, well known triangle test. This test has a relatively low statistical power. This is why nowadays other tests with higher statistical power, like the Tetrad test, are used. With these tests you get a more efficient answer on the question on differences. Furthermore, you are also assured that the search has been extensive enough.

Essensor is happy to advise you on the most appropriate test to answer your questions.