Moreover, Hierarchical measurement considers services outcomes,
which were void in SERVQUAL.
Validity and Reliability of this model has been tested and approved in different areas by other marketing researchers.
Results show the hierarchical instrument as the most advantageous approach to service quality assessment to date (Pollack, 2009) .
Finally, by this review of litecan conclude that the Hierarchical Service Quality is the most suitable and helpful measurement for managers to collect the right information and make the right decisions.