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This part of ISO/TS 20282 specifies a user-based summative test method for the measurement of the usability and/or accessibility of consumer products and products for public use (including walk-up-and-use products) for one or more specific user groups. This test method treats accessibility as a special case of usability where the users taking part in the test represent the extremes of the range of characteristics and capabilities within the general user population. When the test method refers to usability, the method can also be used to test accessibility (unless otherwise specified).This test method is for use when valid and reliable measures of effectiveness, efficiency, and satisfaction are needed.NOTE 1 Products for public use include walk-up-and-use products that provide a service to the general public.The test method can also be used to assess the usability and/or accessibility of achieving the goals of unpacking, installing, and setting up a consumer product.This part of ISO/TS 20282 is intended to be used for testing the usability and/or accessibility of products when— it is possible to identify typical contexts of use that are representative of the use of the product(s),— it is possible to identify the criteria for the successful achievement of the users’ goal, and— there are a limited number of goals being tested at the same time.While the test method is intended to test consumer products and products for public use, it can also be used to test other products, systems, and services with the characteristics described above.