But the assessment method for consumer perceptions of service and the critical factor to make the customer perceived quality produce a essential leap have been the qualitative problem that perplex the researchers and practice men.

• 然而，对于服务质量的衡量及评价方法乃至如何发现使顾客感知服务质量产生质的飞跃的关键要素问题，一直困扰着理论研究者和实践开发者。