1. A method on an information processing system for modifying at least one data warehouse schema based on detected changes in an associated observation model, the method comprising: determining if at least one new observation model has been created; determining if at least one existing observation model is associated with the new observation model; in response to the existing observation model being associated with the new observation model, identifying at least one changed attribute by comparing the new observation model and the existing observation model; updating a set of files associated with the existing observation model to reflect the changed attribute between the new observation model and the existing observation model.