Nokia Intwine China Telecom The IETF has published a number of YANG data models for automating the provisioning and delivery of network and connectivity services, including the L2SM, L3SM, L2NM, L3NM, Attachment Circuits, and Network Slicing models. These models are intended to provided abstracted representations of common operator services, exposing only the necessary parameters for configuring and managing services. These abstractions help to contain the complexity of service provisioning within the necessary domains, making the implementation of complex, multi-domain services easier to implement and manage. However, operators have reported persistent challenges in operationalizing these abstractions in a consistent, scalable, and automatable manner. This document describes the problem space for the ONSEN Working Group, identifying the operational gaps and deficiencies in existing IETF service and network abstraction models that complicate, or prevent effective end-to-end automation. The problems documented here are initially drawn from operator experience, and from the findings of the IAB NEMOPS Workshop. It is a living draft, not intended for publication as an RFC, and will be updated with new problem descriptions as the ONSEN work proceeds. This document does not propose solutions, protocols, or new data models.