Dear Authors, I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are not addressed in last call may be included in AD reviews during the IESG review. Document editors and WG chairs should treat these comments just like any other last call comments. Document Reviewed - Two-Way Active Measurement Protocol (TWAMP) Data Model Link to Document - https://tools.ietf.org/html/draft-ietf-ippm-twamp-yang-09 Status: Ready for publication Summary: This document specifies a data model for client and server implementations of the Two-Way Active Measurement protocol (TWAMP). The document describes and covers the scope and applicability, data model overview and detailed description of the data model. General Comments and Feedback: The document as reviewed is well written had has undergone considerable review. No additional items were seen in this review beyond those already address in previous reviews (and versions) from genart and secdir. No other comments and/or recommendations are made as part of this review focused on operational considerations. regards, Victor Kuarsingh