Current water accounting methods and tools all have different histories, intended objectives, and outputs. This section will explicate these origins and core functions in order to shed light on the circumstances for which various methods and tools may (or may not) be appropriate and effective for purposes of corporate water accounting. In doing so, we attempt to assess the scope of the method/tool and its intended objectives and subjects/audiences, as well as the information captured in the end product/analysis. Water Footprinting Life Cycle Assessment WBCSD Global Water Tool GEMI Water Tools Summary of Scope and Structure for Major Corporate Water Accounting Methods and Tools