This document discusses the GAPS model of service quality. It describes the customer gap as the difference between customer expectations and perceptions, and identifies four provider gaps that must be closed to close the customer gap. The four provider gaps are: 1) not knowing what customers expect, 2) not selecting the right service designs and standards, 3) not delivering to service designs and standards, and 4) not matching performance to promises. Key factors that can lead to each provider gap are identified, such as inadequate marketing research, lack of customer-driven standards, and failure to deliver according to established service designs and standards. The goal of the GAPS model is to understand and close all gaps to ensure customer expectations are met or exceeded.