A taskforce headed by Anson Chan Fang On-sang will formulate an orderly admission plan for mainland child migrants as soon as possible, a senior official said yesterday. 'We will first try to assess the number of the mainland children eligible for permanent residency and thus the demand on community services,' Secretary for Security Regina Ip Lau Suk-yee said. 'We will then discuss with the mainland authorities the orderly entry of such children and the number we can cope with each year.' Mrs Ip was speaking after she and Immigration Director Ambrose Lee Siu-kwong briefed Acting Chief Executive Mrs Chan on talks in Beijing. A Census and Statistics Department spokesman said a survey conducted three years ago showed there were 320,000 legitimate children of Hong Kong people born on the mainland. The largest group, 22 per cent of the total, was aged 20 to 29. Professor Liu Pak-wai, a member of the Commission for Strategic Development, said it would be wise to allow mainland children to come as early as possible so that they could contribute.