| A theme is a collection of modules that address a global topic. For example, one of the themes in GROW is 'Effects of Water on Soils'. Under this theme, the user can learn from a series of modules that provides a learning experience in a variety of related topics on the influence of water on soils from K-12 level to graduate and professional levels. There are three key characteristics of themes: 1) The hierarchy of knowledge in the themes provides learning flexibility and guided choices that allow a user to learn as much as he/she wants using the various modules in GROW. 2) The modular structure allows users, in particular educators, to select modules from within a theme or from several themes to build his/her own library or a course. 3) The themes and modules serve as gateways to links on similar topics.
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