This procedure is only used when circumstances do not permit open tendering, for example, on grounds of extreme urgency or security, for proprietary products or for reasons of compatibility.

• 只有在情况不容许进行公开招标时,例如时间极为紧迫,或基于保安理由,或采购的是专利产品,又或为确保兼容起见,才会采用这种招标程序。