The purpose of this document is to help education agencies identify the types of workforce data that are most useful for understanding immediate teacher shortages and monitoring educator supply and demand, as well as best practices for using these data. This resource supplements the information in the "Forum Guide to Staff Records" (2021), which was developed to help education agencies effectively collect and manage staff data, protect the privacy of staff data, and ensure that requests for data access and data releases are managed appropriately. That guide included a discussion of types of staff records, updated best practices for data collection and management, and case studies from state and local education agencies (SEAs and LEAs). While the 2021 guide briefly discusses the types of data that are useful for understanding educator supply and demand--such as licensure, certification, and teaching assignment data--it more broadly addresses all types of data included in staff records. This supplemental resource delves specifically into questions around data related to educator workforce supply and demand while building on the best practices and privacy protections outlined in the Forum Guide to Staff Records. This guide focuses mainly on SEA and LEA educator workforce data, but a few federal education resources are also highlighted throughout. Additional federal resources are provided in the appendices.