Abstract: Methods, systems and apparatus, including computer programs encoded on computer storage media for a data record resolution and correlation system. One of the methods includes obtaining data sets each including records associated with entities, the records each specifying information for a plurality of aspects of an entity, the information being encoded in the records, for each of the data sets, according to a respective format. One or more bundles are determined from the data sets, with each bundle indicating records determined to be associated with a same entity and determined using similarity rules that compare aspects specified in the records. Information describing a particular bundle is presented to a reviewing user, and the reviewing user can specify one or more records included in the particular bundle that are properly matched. The particular bundle can be updated based on the reviewing user's specification.