Developing standards and test requirements is difficult, as it involves coming to consensus with a group of people with different backgrounds, interests, and motivations. It is essential that standardization groups begin with a clear agreement on the purpose of whatever they are developing. This is usually relatively clear for safety standards and test targets, but sometimes more nebulous for performance standards. This agreement on purpose is critical not just to facilitate reaching consensus, but also to the future success of the tool or standard. As an example, the purpose of the ophthalmic safety standard is clear (avoid blinding people) and the standard is heavily used. The OCT standard, on the other hand, did not have a clearly agreed upon purpose, and has not been widely adopted. For phantoms that reduce the need for human testing, however, this need for consensus is much reduced, as the benefit can quickly become self-evident..
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