ABSTRACT
All components of the system are critically dependent upon each other and are implicitly or explicitly present in every measurement activity. Chemical measurements are undertaken to answer questions necessary in solving problems. A problem must be represented by a model that sets forth the questions that need to be answered and defines the data requirements and their utilization. With only a little reflection, it is clear that chemical analysis is more than a single process and may be better characterized as a system consisting of a series of interdependent processes. For effective solution of a problem, the conditions must be satisfied. The model must be correct, or else the data can hardly be useful for the intended purpose. Since the plan addresses all technical aspects of the measurements, it is obvious that it cannot have any major faults.
