Communities develop systems to improve the lives of people who live there. Grade 3 PYP How we organize ourselves. 24 Vocabulary words each with a picture, a definition, and an example sentence. Vocabulary words include: donate, contribute, charity, market, community, improve, experience, needs, wants, local, global, citizen, system, organization, campaign, self management, principled, discussion, decision, advertise, debate, persuasive, persuade, and convince.