Lack of satisfactory progress in mainstreaming disaster risk reduction within development is attributed to various factors. One of the important factor that is often not much appreciated is the inadequate comprehension of mainstreaming and the absence of clear, cogent and practical guidelines, tools and techniques for mainstreaming DRR within development. This Guidebook helps to tackle this challenge by providing strategic and practical guidelines on how to mainstream disaster risk reduction into their policies plans and programmes across key sectors. It discusses strategic approaches towards risk resilient development in the Asia-Pacific region and demonstrates how to operationalize them using examples from various countries in the region. These guidelines can be adopted by countries according to their specific contexts, resources and capacities.