 Banyere enriched ajụ, na ya pụta na Ansolabehere na Hersh 2012 mgbabere uzo on abụọ isi nzọụkwụ: 1 ikike nke Catalist ikpokọta ọtụtụ disparate data isi mmalite na-emepụta ezi-nwe-datafile na 2 ikike nke Catalist ejikọta ihe nnyocha e mere data na- nwe ya datafile. 