Where does service quality collide?

The customer's overall judgment of a service's excellence or superiority, defined by Parasuraman, Zeithaml, and Berry as the gap between the service a customer expects and the service they perceive. Their 1985 A conceptual model of service quality built the gap model from focus-group work, tracing perceived quality to a chain of shortfalls between what management believes customers want, what the service promises, what it delivers, and what customers finally perceive. Three years later they turned it into SERVQUAL, a twenty-two-item instrument scoring five dimensions, reliability, responsiveness, assurance, empathy, and tangibles, as the difference between expectation and perception ratings. This is the origin: every other field on this map measures the same felt gap under a different name.[1][2]

Unit

A customer's expectation-minus-perception judgment of a service

Recovery means

Not applicable

Measured by

SERVQUAL: twenty-two paired expectation and perception items across five dimensions

The same customer judgment treated as an outcome of the service delivery system, and the site of the field's sharpest measurement dispute. Cronin and Taylor's 1992 Measuring service quality: a reexamination and extension argued that the expectation half of SERVQUAL adds nothing: a performance-only scale, which they named SERVPERF, built from just the perception items, predicted overall quality and purchase intentions better than the gap score did. To operations researchers the construct is the delivered quality of an encounter, a result to be managed alongside cost and speed, and the open question is whether to model it as a disconfirmed expectation or as a direct performance rating.[3]

Unit

A customer's rating of delivered service performance

Recovery means

Not applicable

Measured by

SERVPERF: the twenty-two perception items scored without the expectation baseline

The construct carried onto the web, where no human server stands between the firm and the customer and the interface does the delivering. Parasuraman, Zeithaml, and Malhotra's 2005 E-S-QUAL rebuilt the scale for online shopping, keeping perceived service quality as the target but replacing the interpersonal dimensions with efficiency, fulfillment, system availability, and privacy, plus a separate recovery scale for when a transaction goes wrong. It is the same judgment of excellence against expectation, now applied to a website rather than a branch or a phone call, and it supplies the service-quality leg of information systems' own DeLone and McLean success model.[4]

Unit

A user's judgment of a website's service quality

Recovery means

Not applicable

Measured by

E-S-QUAL: twenty-two items on efficiency, fulfillment, system availability, and privacy

The same construct as patients experience it, where the service is care and the customer is often anxious and poorly placed to judge the technical work. Dagger, Sweeney, and Johnson's 2007 A hierarchical model of health service quality modelled patient-perceived quality as a higher-order construct built from interpersonal, technical, environmental, and administrative dimensions, each with its own subdimensions, and showed it drove satisfaction and behavioural intentions. The felt gap between expected and perceived care is the same object services marketing named; what changes is the dimension set, tuned to a setting where empathy and reassurance carry weight that price and speed do not.[5]

Unit

A patient's judgment of the quality of care received

Recovery means

Not applicable

Measured by

Multidimensional health-service-quality scales spanning interpersonal, technical, environmental, and administrative dimensions