This manual provides a staged approach to develop and conduct a rapid assessment of adolescent health needs at the national level. A variety of methods and tools as options for data gathering follows a brief overview of adolescent health. Illustrations of planning tools and descriptions of specific strategies to assist field implementation based on cases from experience in the filed are also included. The manual is designed as a flexible guide for use not only by those undertaking a national-level rapid assessment of adolescent health needs, but also by those who conduct regional or local-level assessments with some adaptations. A 10-day schedule that can be used by teams to develop a plan to conduct a rapid assessment in a country is also included in the appendix.