Background and Purpose - In this study we investigate determinants of customers’ quality perceptions in service processes which involve customer participation and customer to customer interaction (CCI). Building on existing multidimensional approaches to service quality we explore relevant quality aspects for related to the performance customer participation and CCI. Design/Methodology/Approach – The study builds on focus groups conduct with employees and customers of a leading provider of educational, and science services, which offered a portfolio of service activities requiring very diverse levels of customer participation and CCI, to characterize service quality dimensions. Results - The study distinguishes three dimensions of service ...