The Gaps Model of Service Quality identifies 4 gaps that can lead to unsatisfactory service quality:
1) The customer gap is the difference between customer expectations and perceptions of service.
2) Provider gap 1 occurs when providers do not understand customer expectations.
3) Provider gap 2 happens when the wrong service designs and standards are selected.
4) Provider gap 3 is the failure to meet intended service standards. Provider gap 4 is the disparity between delivered service and what was promised to customers.