THE University of Hong Kong has the largest number of expatriate teachers of all nine tertiary institutions, with more than half of its academic staff coming from overseas. Figures for the 1993-94 academic year show that the university employs 309 overseas teaching staff - slightly more than its 297-strong local teaching team. The Academy for Performing Arts and the University of Science and Technology also have more overseas staff than locals. The academy has 36 overseas staff and 35 local employees, while the university has 166 expatriates and 137 locals. City Polytechnic, the Hong Kong Polytechnic and Baptist College proposed recently that they be upgraded to university status. All three have small expatriate teams representing less than 30 per cent of total staff. City Polytechnic has 181 overseas teachers among its total of 644 staff, while the Hong Kong Polytechnic has 159 in its 903-strong teaching staff. Baptist College has 60 overseas staff out of a total of 278. Individual educational institutions have autonomy in selection and management of staff.