This International Standard presents principles and examples of practical application for the construction of subjective scales for use in the assessment and evaluation of the physical environment. This international standard considers scales of perception; comfort; preference; acceptability; expression form and tolerance It does not consider other scales such as those related to the effects of the environment on the ability to read displays or signs, on manual performance or on psychological conditions such as mood etc. This international standard does not consider scales related to pain or scales related to stimuli that could lead to injury. Environmental components considered include thermal, visual, air quality, acoustic and vibration. This International Standard does not standardise particular scales, it provides the principles that will allow users to construct appropriate scales for their application. This International Standard does not present principles of surveys (see Note 1) or questionnaire design. However, the scales that are developed using this standard may be incorporated into surveys or questionnaires. NOTE 1 Environmental surveys are described in ISO 28802, (2012). ISO 28802, (2012) includes scales that are complementary to, and based upon, the principles of scale construction that are described in this international standard.