The Home Ownership Scheme (HOS) and Private Sector Participation Scheme (PSPS) were introduced by the HA in 1978 and 1979 respectively to assist low and middle income families to purchase homes at prices below market value.

• 房委会在一九七八及一九七九年先后推出居者有其屋计划(居屋计划)及私人机构参建居屋计划(私人参建计划)，以协助中等及低入息的家庭，以低于市值的价格购买住宅单位。