This memorandum documents updates that have been made to the Count Review Operation (CRO) since the release of the 2020 Census Detailed Operational Plan (DOP) for the Count Review Operation on July 26, 2019. The operational changes are modifications or additions to the CRO activities and subactivities in the CRO DOP, which includes several updates that are related to the COVID-19 pandemic. The updates, summarized below, are provided to ensure accurate final documentation is available to the public. Sections and page numbers refer to the locations within the DOP.

• Operational Context Diagram (Figure 1), Page 9: Decennial Response File 1 (DRF-1) is added on the Inputs section box 19 (RPO) and Outputs section Finding’s box (IE843) to reflect the review of this file. The DRF-1 was not initially part of the scope of CRO but was included in response to the COVID-19 pandemic.
• 2.3.2.3 CRO Operational Outputs (Table 3), Page 19: DRF-1 file is added to the Information Exchange for the Response Processing Operation (RPO). This file was not initially part of the scope of CRO but was included in response to the COVID-19 pandemic.
• CRO Operational Context Model (Figure 4), Page 34: The operational context model is updated to reflect the addition of the DRF-1 Review because of the COVID-19 pandemic. The changes are applied, as well, to Figure 5 (page 35), Figure 6 (page 37), Figure 11 (page 43), and Figure 25 (page 54).
• 3.2.2.2. Post-Enumeration Group Quarters Review, Page 42: The Post-Enumeration Group Quarters Review was initially planned for June 15-19, 2020 (remote) and June 16-17, 2020 (on-site). This program was pushed to September 14-18, 2020, because enumeration operations were extended until September 2020 in response to the COVID-19 pandemic. This extension impacted the Review Event 2 schedule. A modified remote Review Event 2 was scheduled for September 23-28, 2020, and the on-site review was canceled because of COVID social distancing restrictions. The main changes for the modified review were that the participants used Excel files to review the group quarters for their state instead of the Group Quarters Processing Control System (GQPCS). In addition, only nonenumerated GQs that had an enumeration disposition reason of “Cannot Locate in Block” were provided to the state participants for their review. The opportunity to add new GQs and use of the Geographic Update Partnership Software (GUPS) as a reference tool were not provided to the participants because once the initial review was canceled, access to the census network was removed and couldn’t be reinstated in time for the modified review.
• 3.3 Census Count and File Review (CCFR), Page 44: CCFR review was postponed to October 2020, and in response to the COVID-19 pandemic, a review of the DRF-1 file by subject matter experts was added to the scope of the operation. The review of the files was completed in June 2021.