TWENTIETH CENTURY ADVICE LITERATURE focuses on gender roles and relations, American consumerism, views of democratic citizenship, character development for children, changes in reaction to each major war (including World Wars I and II, Korea, and Vietnam), class relations, and adjustments to new technology (such as proper manners when using the telephone, point-and-shoot camera, or e-mail). Included are how-to books and guides; employee manuals, sorority and fraternity pledge manuals; scouting manuals; textbooks that deal with home economics, health and hygiene, and sex education; teacher-training and course manuals; commercial literature that promotes specific behaviors; and government instruction manuals for a variety of workplaces and industries.