A model by Kaj Storbacka, Tore Strandvik, and Christian Grönroos (1994), the service quality model, is more detailed than the basic loyalty business model but arrives at the same conclusion.
Kaj Storbacka, Tore Strandvik和Christian Grönroos (1994)提出了服务质量模型，比基本忠诚度商业模型更加详细，但是结论相同。