Book excerpt: When a W&MA makes decisions within a specific jurisdiction, it is beneficial to understand the scope of the entire system and to reflect upon methods and practices that have been tested over the years. This handbook was developed for the W&MA to be used as a reference tool. It is designed to be read in sections as needed for a specific situation or to learn piece by piece about the weights and measures system as a whole. The weights and measures infrastructure includes the following: Standards and Units; Laws, Regulations, and Practices; Metrology Lab¿s.; Weighing and Measuring Devices; Packaged Products; Service Industries; Weights and Measures Regulation; and Commercial Transactions. Charts and tables. This is a print on demand report.