The goal of this study was to investigate factors that influence consumers' perceptions of service encounter satisfaction, overall service quality, and trust in the service provider for pharmacist consultation services. We used the Dynamic Process Model of Service Quality as the framework for investigating the formation of these evaluations. Consumers' prior expectations of what should and will transpire during the service episode(s) and the performance level of the actual delivered service during the service encounter(s) were hypothesized to affect satisfaction, quality, and trust. Two experiments using a 2x2x2 fully-crossed factorial design were used for collecting and analyzing data. The results showed that normative (should) and predictive (will) expectations play differential roles in consumers' evaluation of satisfaction, perception of quality, and trust in the service provider. Also, there appeared to be differential roles that a particular type of expectation will serve depending upon the level of service performance.