Tajemniczy klient jako metoda badawcza – wybrane problemy

The specificity of services implies the need to monitor their quality. Methods for assessing non-consumer services are constantly sought after. The mystery client method is one of them. The purpose of this publication is to diagnose the procedures used in marketing research, and in particular to use the mysterious client method in which the assessment is conducted by a team of people. To verify this approach, the quality assessment of gastronomic services was used in selected restaurant chains, such as Pizza Hut, Pizzeria Da Grasso, Bobby Burger and Bierhalle. The innovation in the study was the use of group to evaluate services. The adopted methodology allowed to conduct the study in close to real conditions, because usually people go to a restaurant together. Building teams that would jointly assess the quality of services gives also the opportunity to reduce the diversification in perception and different experiences of people participating in the study.