My husband did his last year and passed. The interview was for about half an hour and he was just asked about the different machines, measuring equipment, and tools he had used. He was asked something about each questions on each section of the Tradeset report and the areas he did not have experience of he just told them. It was more to gain clarification of what he had worked with rather than testing his knowledge of the trade. We had provided an extensive work history and in his references had listed the details of all areas of his jobs, what he produced and the machinery used. We also provided pictures where possible of the machinery he worked on. Hope this helps, and good luck.