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Operations and maintenance (O&M) manuals have long been used for organizing and presenting information relevant to operating and maintaining water and wastewater infrastructure. The content of paper-based O&M manuals has been historically limited to text describing basic configuration and design criteria and operation and maintainance procedures. Text in paper-based manuals is usually augmented with select graphical images such as schematic diagrams, key plans and isometric views. Electronic O&M manuals offer a means of expanding the amount of information. However, if not properly implemented, they can suffer from many of the same shortcomings as paper-based manuals. This paper describes the elements of an electronic O&M manual, discusses various issues that must be considered when developing a robust installation, and evaluates implementation considerations. See more