During the early scoping stages of the project, it became apparent that a one-dimensional classification of public health might look very different, depending on its intended use, and user group. A simple, one-dimensional classification of public health could not satisfy all the needs, or gel with the diverse world-views, of its disparate potential users. To provide a 'unified framework for multiple uses', a multidimensional public health classification with explicit modeling of the relationships among dimensions is needed, rather than a single, mutually exclusive, hierarchy of categories. 20