This document discusses key concepts related to gender and development (GAD) in the Philippines. It begins by defining sex and gender, explaining that gender is socially constructed while sex is biological. It then discusses how gender roles are socialized through various agents and institutions. The document also defines different types of power in relationships before explaining manifestations of gender bias like stereotyping, marginalization, and multiple burdens. It emphasizes that implementing GAD is important for development, participatory governance, and complying with international agreements. Finally, it discusses how to implement GAD through gender mainstreaming in policies, plans, and programs.