A method and data repository for the delivery, storage, maintenance and controlled access to test data, stored in a centrally administered data repository. The system allows entities to store individual collections of data which may be public or private in keeping with their business needs, while permitting them to have or obtain access to other data within the repository in which they might have an interest. Reflecting the natural flow of information, the system uses a data storage schema that permits the storage of a virtually unlimited variety of test results in a series of compact structures. To do so, the schema utilizes a series of metadata structures that describe collections of instance specific information.