Abstract: Telecommunications or similar bills are prepared on diskette in an optimal format for further processing, display, and analysis on popularly-available, inexpensive personal computers. A telecommunications carrier provides, for participating customers, appropriately selected billing records at the stage in the carrier's ordinary billing process after the carrier has completed all billing activities except actually printing a paper bill. This ensures that the information ultimately supplied on diskette will exactly correspond to that on the paper bill. In a first step, preferably performed on a large computer, the records are sorted, edited and reformatted into an optimal organization for further processing on a personal computer. In addition, a variety of preprocessed summary reports and graphs are prepared for rapid retrieval on the customer's computer.