In order to get a successful effect without letting a Chinese lose face any criticism should be delivered privately discreetly and tactfully or else just opposite to what you wish.

• 为了能有效的传达意见而不让中国人丢了面子，任何的批评都应当私下传递，并且方式要巧妙而谨慎。否则，你将事与愿违。