This document provides an overview of concepts related to gender and development (GAD) mainstreaming including key concepts like sex, gender, gender roles and characteristics. It discusses the legal bases of GAD, including international agreements like CEDAW. Gender issues like stereotyping, economic marginalization and violence against women are examined. The document also explores strategic gender needs and practical gender needs. It emphasizes that development planning should address obstacles to women's participation and expand their choices and opportunities to promote gender equality.