Motivation is defined as the intensity, direction, and persistence of effort toward attaining a goal. Early theories from the 1950s include Maslow's hierarchy of needs, McGregor's Theory X and Y, Hertzberg's two-factor theory, and McClelland's needs theory. More contemporary theories include self-determination theory, cognitive evaluation theory, self-concordance theory, job engagement theory, goal-setting theory, self-efficacy theory, reinforcement theory, equity theory, organizational justice theory, and expectancy theory. The document also discusses using fear as a motivator.