a logical record order can also be maintained using an index, or inverted list, as they are sometimes called. an index is simply a table that cross-references record addresses with some field value. for example, figure H-8(a) shows the enrollment record stored in no particular order, and figure H-8(b) shows an index on student number. in this index, the student number are arranged in sequence, with each entry in the list pointing to a corresponding record in the original data