This document presents a 5-step approach for cities to become more efficient and sustainable through smart systems. It argues that critical systems like energy, transportation, and buildings need to be improved and integrated using both bottom-up and top-down approaches. The document outlines challenges of rapid urbanization, noting that 70% of the world's population will live in cities by 2050, necessitating expansion. It advocates making cities more efficient, livable, and sustainable to attract residents and businesses through technologies available today and an approach focused on systems.