Multi-business companies often have several human resource departments, with each serving the unique needs of its own business. the decentralization is intended to produce a closer congruence between HR activities such as selection and the strategy and culture of each business unit decentralize does have potential disadvantages ,however .if each division or unit operates independently, it’s likely to select only from among its own employees and not from. The whole work force. Decentralization may also mean that is unit relies on its own performance appraisal system so even if candidates from other divisions become internal applicants, they may be difficult to evaluate. This reality is magnified in global firms regions of the word may become unrelated to each other, and the human resources of one region may be completely off limits to the others.