To succeed, he needs to know the valence of the expectations, their strength and the different ways of creating certain expectations. It is extremely important for the managers to use the motivational theories in order to keep their best performers working for them and also to motivate the productivity of the person which does not perform very well. In British Gas, the managers are using the McGregor`s theories. It is absolutely forbidden the employees to share and to tell to anybody the amount of their salaries. The leaders of the teams are making different performance appraisals every month, every six months and at the end of the year. Depending on the results of the person performance his leader creates the target to be met for the next appraisal and includes bonus in his salary if he has met the minimum target. If the worker reaches 80% from the target for more than 6 times in a year, his salary is revised. This is stimulating the improvement of the personality of the employee and motivates him to be happy with his work for the company.