In the 1960s and 1970s he worked out his theories of data arrangement, issuing his paper "A Relational Model of Data for Large Shared Data Banks" in 1970, after an internal IBM paper one year earlier.
1960-ih i 1970-ih radio je na svojim teorijama slaganja podataka, izdajući papir A Relational Model of Data for Large Shared Data Banks 1970., nakon internog IBM papira godinu dana ranije.