Interviews, formal or informal, with workers at every level are worth considering as a way to learn about hazards, how well controls work, how the management system or business processes perform, adverse health symptoms, recent experiences, how people are feeling, what concerns them and what they would improve, and it should give interviewers suitable training and tools. In carrying out interviews it should take into account the need for a setting in which workers feel safe answering, for example not being interviewed by their supervisor or someone with authority over them, and free from embarrassment, threats, stigma or reprisal; the literacy of interviewees and the possible need for translators or interpreters; the benefits of confidential discussions one-to-one or in small groups; the use of mainly open-ended rather than yes-or-no questions; non-judgemental questioning that does not steer towards a predetermined conclusion; and accurate, objective listening and documentation.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.