Abstract
The paper collects five articles written by the Author for the "Handbook of Measuring System Design" (Wiley, 2005) and aimed at exploring, from different and complementary standpoints, some fundamental topics of Measurement Science. The first article, "Models of the measurement process", interprets the measuring systems as the instruments that structurally justify the empirical requirement for measurement to be an objective and intersubjective operation. The second and the third articles, "Characteristics and theory of knowledge" and "Principles of semiotics as related to measurement", analyze the crucial role of measurement in the broad context of Information Sciences, in epistemological and semiotic perspective respectively. The last two articles, "Explanation of key error and uncertainty concepts and terms" and "Errors in digital signal systems", deal with the critical topic of the quality of measurement results modeled in terms of uncertainty and error.