Foreword / Michael Little -- What is the 10/40 window / Luis Bush -- The challenge of the 10/40 window / Fred Markert -- Spiritual warfare and the poor in the gateway cities / Viv Grigg -- Prayer journeys to the gateway cities / C. Peter Wagner -- Profiles of the 100 gateway cities.
The top 50% of the world's least evangelized cities are located in a window that extends from West Africa across Asia, between 10 degrees north to 40 degrees north of the equator.