The paper introduces an approach for development of service-oriented software systems aimed at negotiating quality of service (QoS) requirements originated from interactive assessments of simulated service qualities by business stakeholders. This approach is a part of ISAREAD-S framework aimed at involving business stakeholders in a software process in a form of assessing the perceived quality of the service-oriented system (exemplified by service performance and reliability) in its usage context. Requirements negotiation is aimed at reaching the compromise between stakeholder requirements and the resources available for implementation by adjusting either resources or requirements. To find the desired adjustment values we propose to formulate a multiple criteria optimization problem according to the methodology of systemwise optimization. The solution is implemented as a high-level procedure (negotiation policy) based on low-level procedures (mechanisms) collecting stakeholder opinions on perceived service quality on the level of both particular (standalone) services and business processes representing service usage contexts. Key words: quality of service, service performance, service reliability, requirements negotiation, systemwise optimization, quality assessment, business stakeholders.
