Network operators frequently utilize service functions such as packet filtering at firewalls, load-balancing and transactional proxies (for example spam filters) in the delivery of services to end users. Delivery of these types of services is undergoing significant change with the introduction of virtualization, network overlays, and orchestration. The SFC Working Group has developed an Architecture [RFC 7665] and the Network Service Header [RFC 8300] for service function chaining. The focus of the SFC working group moving forward will be on aspects of the architecture and/or protocol that need to be addressed to enable effective deployment and usage of this work. The SFC working group will now begin addressing those items. In order to maintain focus, the working group will primarily produce and advance documents on four topics: 1) Metadata - Define the common type-length-value encoded metadata types with Standards Track RFCs, and produce Informational RFCs to describe common fixed-length (MD-1) metadata usages. 2) Security - Mechanisms for securing metadata for authenticating, integrity protection or confidentiality are not yet defined. What can be effectively provided, for which scenarios, and how those tools can be provided need to be determined and the tools standardized. 3) OAM and O&M - In order for operators to use these tools in production networks, they need Operations, Administration, and Maintenance tools, as well as management mechanisms. This includes YANG models, OAM frameworks, and specific OAM mechanisms to address operational needs. 4) Transport Considerations - This will capture the expectations SFC places on transport behavior, including dealing with issues such as congestion indications and responses. This should define how NSH works on standardized transports that are expected to see widespread use. Specifically, the SFC WG is chartered to deliver the following: 1. A standards track base set of MD-2 type codes within the metadata class reserved for IETF usage. 2. Related Metadata drafts that require more explanation than is reasonable to include in the base MD-2 draft, including MD-1 descriptions and items done once the base draft is complete. 3. YANG models for the SFC Components. 4. One or more security related standards track and / or informational RFCs. At least one standards track security mechanism RFC is needed. 5. OAM Framework document to provide a common basis for OAM work. This draft will include guidance on how active, passive, and in-situ OAM are to be supported if at all. 6. Specific OAM mechanism documents to provide the tools needed for operational environments. 7. Transport Considerations RFC to cover the expectations SFC and NSH place on transport, and the operational constraints transports used by NSH need to meet. The SFC WG may work on informational applicability documents that show how the technology, meta-data, and associated control-plane mechanisms can be used in specific use-cases. The SFC WG may work on information documents that provide operational considerations. The SFC WG will coordinate with BESS and PCE on the control-plane work related to SFC.