The present invention extends to methods, systems, and computer program products for allowing a computer system user to extend the functionality of a data-centric software application. The method includes instantiating the data-centric software application, where the data-centric application has portions of business logic categorized and associated with items of data-centric application functionality defined in a schema. The method includes receiving customization input to customize at least one of the portions of business logic. The method includes formulating a representative model corresponding to at least one of the portions of customized business logic. The method includes applying the representative model to the schema to generate a customized schema that extends the business logic of the data-centric software application. The method includes instantiating the data-centric software application in accordance with the customized schema to customize the functionality of the business logic in the data-centric software application.