Background
Origin-Destination Information System: Revenue, Pieces, and Weight (ODIS-RPW) is the U.S. Postal Service’s primary statistical sampling program used to assist in estimating the national revenue, volume, and weight for mail and parcels by category and class on a quarterly and annual basis. The Postal Service uses ODIS-RPW data to plan and budget; forecast volume, workloads, and overall productivity; conduct management studies; design processing facilities and equipment; and develop rate-setting proposals. The Postal Service has handbooks, guides, and other documentation that establish the policies and procedures to ensure consistent and accurate collection of ODIS-RPW data.
The ODIS-RPW sampling process is divided into two stages. In the first stage, a statistical sample is selected from mail and parcels leaving the postal system on a specific day at defined exit points. In the second stage, data collectors conduct ODIS-RPW tests for selected exit points as either a digital or on-site test.
What We Did
Our objective was to determine whether the Postal Service conducted ODIS-RPW statistical tests in accordance with established policies and procedures. We reviewed 50 digital tests and seven on-site tests, as well as interviewed Postal Service management to gain an understanding of the ODIS-RPW process.
What We Found
We found data collectors generally recorded most mailpiece data correctly during ODIS-RPW tests conducted during fiscal year 2026 quarter (Q)1 and Q2, though we found some exceptions. We identified opportunities to use emerging technology and make changes to the existing systems used to conduct tests to reduce exceptions. In addition, we found testing facility records were not always updated timely by the Postal Service prior to sample selection.
Recommendations and Management’s Comments
We made three recommendations to address the issues identified in the report. Postal Service management agreed with the recommendations, and the U.S. Postal Service Office of Inspector General (OIG) considers management’s comments responsive. Management’s comments and our evaluation are at the end of each finding and recommendation.
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