This toolkit provides a variety of resources, tools, and references for using a positive youth development (PYD) approach in youth-focused programming in low and middle-income countries. Positive youth development is an approach that aims to build and support the competencies, skills and abilities of youth so that they are empowered to reach their full potential. The toolkit is specifically geared toward helping program implementers, researchers, and funders integrate PYD principles into program monitoring and evaluation.