SWEEPING changes are expected in Hong Kong's Vietnamese detention centres after top-level meetings are held to review worldwide strategy on boat people next month. Schooling, cash grants and other assistance given to people determined to be non-refugees could all be cut under new arrangements expected to be agreed at a preparatory meeting of signatories to the Comprehensive Plan of Action (CPA). The meeting in Geneva will be attended by chiefs of United Nations High Commissioner for Refugees (UNHCR) missions from the Asian region and it is believed interested parties such as the Hong Kong Government will also be invited. They will prepare the ground and submit proposals to the full steering committee which is to convene early next year. The agenda has not been finalised, but the UNHCR's acting Hong Kong chief, Aziz Ahamed, said the CPA - a plan for dealing with people screened out as non-refugees agreed by 70 countries in 1989 - would be under discussion. Next month's meeting will be one of the first major assignments for Hong Kong's new UNHCR chief of mission, Jahanshah Assadi, who is expected to arrive here in the next few days after briefings in London. Mr Ahamed said: ''There will be a preparatory committee meeting sometime in November. The date of the full steering committee has not been finalised but it will be in January or February. ''Sometimes outside bodies are included and the Hong Kong Government would be involved because it is not an outside body, but a participant in the CPA.'' Various issues would be raised at the preparatory meeting to put together firmer proposals to be discussed by the full steering committee. ''As the CPA has been in action for the last four years there will be a lot to talk about,'' Mr Ahamed said. ''They will be discussing the screening status, which should be completed for most countries. Hong Kong is the one that is taking the time, but it had many more arrivals. ''The future of the boat people determined not to be refugees will be addressed. ''The international community needs to decide what it is going to do now about the people who are left, the people who are not volunteering to go home. ''The limit of assistance given on returning to Vietnam, or services in the camps may be cut, but it is all up to the international community.'' The UNHCR has cut the reintegration grant payable to boat people by a third if they delay their return to Vietnam by more than three months after being screened out as non-refugees. The threat of a reduction from US$360 (HK$2,782) to US$240 has prompted an increase in the number of people volunteering for repatriation and further cuts have not been ruled out. Other possible action in the camps could focus on schooling, with the education provision for children whose parents refuse to return being axed, or provided only up to a primary level. Hong Kong's Refugee Co-ordinator Brian Bresnihan said yesterday the Government had not yet been invited to the talks. ''All we know is that there is a proposal to hold a planning meeting sometime before the end of this year with a view to preparing for the steering committee,'' he said. ''It's premature to talk about any details, a date hasn't even been fixed yet.''