Landscape studies should be conducted by or under the direction of staff meeting the Secretary of the Interiorís Standards for Professional Qualifications. In many agencies, qualified staff historians, architectural historians, prehistoric archeologists, and historical archeologists work together on interdisciplinary teams as needed. Landscape architects and cultural geographers can bring specific experience to landscape studies. Other professional staff, outside experts, and published works can be consulted for additional expertise. Whether work is done in-house or by consultants working under contract, it must be accomplished or overseen by professionals meeting the Secretary of the Interiorís standards in one or more of the appropriate disciplines.