I want to use gap between customer expectations and perceptions as the customer satisfaction index. Should I do it? Please suggest some literature where it has been done so.
Sunita- well it looks like it could be a good start. Not seen this theory...my ideas were driven mostly from my own introspection.
The missing elements for me are Context and also the goal , or "job to be done" that is explicitly or implicitly in a person's mind. I've not looked into how expectations are actually created or stored in the mind..though would expect (!) it is linked to emotion, certain triggering cues and memory of similar or analogous events, that are used as proxies...maybe another way to think about them is personal strategies and habits.