Motivation and Outline -- A General Description of Measuring Devices: Plan -- A General Description of Measuring Devices: First Step - Finite Set of Possible Outcomes -- A General Description of Measuring Devices: Second Step - Pairs of Compatible Outcomes -- A General Description of Measuring Devices: Third Step - Subsets of Compatible Outcomes -- A General Description of Measuring Devices: Fourth Step - Conditional Statements about Possible Outcomes -- A General Description of Measuring Devices: Fifth Step - Disjunctive Conditional Statements about the Possible Outcomes -- A General Description of Measuring Devices: Summary -- Physical Quantities: A General Description -- Properties of Physical Quantities -- Future Work.