This Guide establishes general rules for evaluating and expressing uncertainty in measurement that can be followed at various levels of accuracy and in many fields - from the shop floor to fundamental research. Therefore, the principles of this Guide are intended to be applicable to a broad spectrum of measurements, including those required for:
⎯ maintaining quality control and quality assurance in production;
⎯ complying with and enforcing laws and regulations;
⎯ conducting basic research, and applied research and development, in science and engineering;
⎯ calibrating standards and instruments and performing tests throughout a national measurement system in order to achieve traceability to national standards;
⎯ developing, maintaining, and comparing international and national physical reference standards, including reference materials.