Answers will vary. In the early 1900s, key management thinkers focused on efficiency and productivity, dictating precisely how workers should do each element of their jobs. But more recent research suggests that people's thoughts and feelings play a vital role in motivation, which leads to a range of new theories.Usually attributed to researcher Victor Vroom, expectancy theory deals with the relationship among individual effort, individual performance, and individual reward. The key concept is that a worker will be motivated if he or she believes that effort will lead to performance, and performance will lead to a meaningful reward. The theory suggests that if any link in this chain is broken, the employee will not be motivated.Pioneered by J. Stacy Adams, equity theory proposes that perceptions of fairness directly affect worker motivation. The key idea is that people won't be motivated if they believe that the relationship between what they contribute and what they earn is different from the relationship between what others contribute and what others earn. The response to perceived inequity almost always involves trying to change the system, changing your own work habits, distorting your perceptions, or leaving the company.However,equity theory is based on perceptions, which are not always on the mark. People are all too prone to overestimate their own contributions, which throws perceived equity out of balance. The best way to combat equity issues is through clear, open communication from management.