Tung Chee-hwa is examining Australian and New Zealand systems to improve the accountability of his top aides, a source close to the Government said. A committee headed by the Chief Executive held meetings with key policy secretaries recently on reforming the accountability system, the source said. It is understood that secretaries he appointed will be freed from the civil service and reappointed on contract terms. They are expected to share political responsibility with Mr Tung. Retiring Chief Secretary for Administration Anson Chan Fang On-sang, Financial Secretary Donald Tsang Yam-kuen, Secretary for Constitutional Affairs Michael Suen Ming-yeung and Secretary for Civil Service Joseph Wong Wing-ping also sat on the committee. Mr Wong has just returned from Australia and New Zealand to learn from their experience in civil service reform in the 1980s. Chinese University professor Lau Siu-kai said the Chief Executive could learn how both countries wrote contracts for senior public servants. 'The criteria of performance are written into the contracts, which can be terminated at any time without any reason - there is no legal requirement for that,' Professor Lau said. Mr Tung's decision on reform would be revealed when he delivered his Policy Address in October, the source added.