Abstract
Words have nothing magic in them: there are no "true words" for things, nor "true meanings" for words, and discussing about definitions is usually not so important. Measurement assumed a crucial role in physical sciences and technologies not when the Greeks stated that "man is the measure of all things", but when the experimental method adopted it as a basic method to acquire reliability? Can this reliability be assured for information related to non-physical properties? Can non-physical properties be measured, and how? This paper is devoted to explore these issues.