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28. Measurement method (2.3): The structure of a process of measurement [analogous to the VIM definition [2.5]].
29. Direct (method of) measurement (7.2.3): A method of measurement such that
(i) a measuring instrument is used that is coupled with the object under measurement and is designed to interact with instances of the general property of
the measurand, and (ii) the model of the measurand is only used in measurement for identifying the measurand [the VIM does not define this concept].
Figure A.2 summarizes the black box model of the key entities related to measurement> and their relations, as interpreted in this book (uncertainty not
included).
Figure A.3 summarizes the white box model of the key entities related to measurement> and their relations, as interpreted in this book (uncertainty not
included).
30. Indirect (method of) measurement (7.2.3): A method of measurement such
that (i) one or more measuring instruments are used that are not necessarily
coupled with the object under measurement or designed to interact with
instances of the general property of the measurand, and (ii) the model of the
measurand is used in measurement for identifying the measurand and its depenFig. A.3 The white box model of the key entities related to and their
relations
Appendix A: A basic concept system of measurement