According to Maslow's theory, a manager will not be able to motivate an employee with challenging tasks if the employee does not make enough money to pay for basic necessities. According to Herzberg's motivation theory, good working conditions will prevent dissatisfaction but will not lead to feelings of satisfaction. Behavior modification principles can be useful to managers who seek to change employee behavior through rewards or punishments linked to performance. The standard plan is like the piece rate plan except instead of getting hour a rate per piece, the employee gets a premium equal to the percent by which his or her performance exceeds the standard. With a standard hour plan, employers do not need to recalculate piece rates when changes are made to the hourly pay rate. All merit raises become part of an employee's base salary. In order for a firm to have an effective incentive plan, there should be a clear relationship between employee effort and quantity or quality of output. Straight commission plans are attractive to high-performing salespeople. An effective incentive plan involves gathering evidence and evaluating the long-term effects employee performance