The LibQUAL+ TM instrument derives from the Gap Theory of Service Quality, and the SERVQUAL instrument. Grounded in the constructs of discrepancy theory, the SERVQUAL protocol itself, is anchored by a singular precept: through a series of 22 questions the SERVQUAL instrument undertakes to measure the delivery of service quality across the five dimensions: reliability, assurance, empathy, responsiveness, tangibles. It has been established as defining the service quality construct.
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Cook et al. (2003) studied this question.
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