1. A computer-implemented method for identifying reference data tables in an extract-transform-load data integration process comprising: identifying, by operation of one or more computer processors, at least a first reference data operator in the process, wherein the first reference data operator references one or more tables; and evaluating at least a first table referenced by the reference data operator to determine whether the first table is a reference data table by assigning a score to the first table, wherein the score is indicative of the likelihood that the first table is a reference data table, wherein a reference data table contains a set of values that describes other data.