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The evolution of bar code standards is briefly discussed. The two standards most frequently adopted by libraries, Code‐A‐Bar and CODE 39, are described in detail. The format of the codes, as used in many library applications, is illustrated. Definitions of terminology employed in the article are appended.

Massive bar coding projects require a great deal of planning and preparation, and usually involve most of a library's staff. The swift and efficient execution of the project is paramount. While a large‐scale bar coding project can be intimidating, detailed planning can prevent hours of anxiety and the need for crisis management. This article attempts to provide a comprehensive overview of the relevant issues for a successful bar coding project. Selecting bar codes, planning and structuring a project, calculating time estimates, and maintaining staff morale are presented in detail. A selected bibliography provides access to more information.