Test Model. Replace or Organise?

When talking about the test model, most often the focus is on the quality of the tests themselves and the coverage. But even the best written and up-to-date tests are not usable without a good structure.

Victoria will tell us how they searched for a balance between formal and informal models, how they modernised test models with 1000+ tests, and how experiments on test model structure can affect the pass rate (including autotests), the "blurring of the tester's eyes" and even the easiness of test model support.