Google LLC University of Aberdeen Introducing new or modified congestion control algorithms in the global Internet has possible ramifications to both the flows using the proposed congestion control algorithms and to flows using a standardized congestion control algorithm. Therefore, the IETF must proceed with caution when evaluating proposals for alternate congestion control. The goal of this document is to provide guidance for considering standardization of a proposed congestion control algorithm at the IETF. It obsoletes RFC5033 to reflect changes in the congestion control landscape.