This document provides an overview of the GloSIS Data Exchange Model being developed by an international working team. It describes the preparatory, identification, and modelling phases of the project. In the preparatory phase, existing soil data standards were analyzed to identify requirements. 359 soil properties were defined in the identification phase. The conclusions were that ISO 28258 would form the basis, enhanced with concepts from other standards. The modelling phase involves developing the conceptual model in UML and an XML schema to implement the standard while allowing for user testing and feedback.