The Monthly Catalog is essential for acquiring, processing, and accessing both depository and non-depository federal documents. The new Monthly Catalog was examined from its first issue in July 1976 through the August 1977 issue to determine if it is better suited to serve these needs. The use of standards cataloging and Library of Congress subject headings, the inclusion of Sudocs, LC and Dewey call numbers, and OCLC identification numbers, and the expansion of the introductory material are long needed changes which greatly increase the value of the Monthly Catalog. The main entries, added entries, and subject headings are being carried extremely accurately into the subject, author, and title indexes, resulting in an average of 5.4 access points per document. The time lag from the date a document is received to the date the respective Monthly Catalog is received is 168 days ±8 days (95% confidence). For the two years prior to the July 1976 issue there was no significant difference between the arrival dates of depository and subscription copies of the Monthly Catalog. After July 1976 the depository copy arrived an average of 11 days sooner (99% confidence) than the subscription copy. Throughout 1975, 1976, and 1977 there has been a gradual decrease in the time lag from closing date of each issue to date received. Although this decrease is also apparent with the biennial and annual indexes, there are still production problems with the cumulations. From the little data available now, it appears documents are included closer to their date of publication, the number of entries per issue is increasing, and the percentage of non-depository documents included is decreasing. Comparison of these results to studies of earlier versions of the Monthly Catalog indicates it is greatly improved. The correction of minor problems in the format and arrangement of the entries and index terms since July 1976 issue indicate it is evolving in response to user needs.