The document discusses MongoDB's use in Argentina's 2010 census: - MongoDB was used as the underlying database coupled with Villmond's content integration framework to build a quality assurance system for processing 200 million images and documents from the census within 4 months. - The QA system allowed controlling quality by showing scanned census booklet images and metadata to 120 concurrent users operating 24/7. - MongoDB provided scalable and fast document storage and querying needed to import around 2 million new images daily from 14 continuous scanning devices.