This is the fourth appendix to the National Transit Adaptation Strategy Phase I FTA Report. Appendix 4 is an interview guide developed by the Institute for the Future (IFTF) and used during a series of 15 interviews with transportation subject matter experts in February 2022. The interviewed individuals’ areas of expertise are directly or indirectly related to public transportation, and their areas of practice include land use and urban planning policy, smart cities, start-ups, micro-mobility and rideshare, municipal and state government. Their backgrounds include government, academia, industry, non-profit, start-ups, business, journalism, and technology. Each interview was 60 minutes and was conducted by one of three members of the IFTF team.