1. Researchers have typically measured values through self-report methods like rating or ranking scales. The most widely used ranking tool is the Rokeach Value Survey which ranks terminal and instrumental values.
2. Shalom Schwartz identified 10 universal human values that are consistently distinguished across cultures. His circumplex model explains how these values relate and the tradeoffs people make between competing values.
3. Values originate from psychological theories like reinforcement, social learning, and cognitive consistency, as well as life experiences that trigger self-examination. Strategies like values self-confrontation aim to change values by exposing contradictions.