SERVQUAL, later called RATER, is a quality management framework. SERVQUAL was developed in the mid-1980s by Zeithaml, Parasuraman & Berry to measure quality in the service sector. ==Concept== The SERVQUAL service quality model was developed by a group of American authors, `Parsu` Parasuraman, Valarie Zeithaml and Len Berry, in 1985. It highlight.....