The trustworthiness of systems that support complex collaborative business processes is an emergent property. In order to address users’ trust concerns, trustworthiness requirements of software systems must be elicited and satisfied. The aim of this paper is to address the gap that exists between end-users’ trust concerns and the lack of implementation of proper trustworthiness requirements in software systems. We focus on the challenges of specifying trustworthiness requirements and integrating them into the software development process as business process models. This paper provides a conceptual model of our approach by extending Business Process Model and Notation (BPMN) for integrating trustworthiness requirements. Our proposed approach explicitly considers the trustworthiness of individual components as part of the business process models. We use an application example from the health care domain to demonstrate our approach.