Which process model notation is used to describe the flow of materials, roles, and work?

The Swimlane Diagram is the correct choice for describing the flow of materials, roles, and work within a process. This notation effectively organizes activities by assigning them to different "lanes," which represent various participants (such as roles or departments) involved in the process.

Using Swimlane Diagrams, you can visually depict who does what within a process, while also mapping out the workflow between different actors. This makes it easier to understand the interactions and handoffs between different roles, as well as the sequence of activities.

The other options, such as Gantt Charts, are specifically focused on project timelines and scheduling rather than illustrating the flow of processes. Flow Charts, while also a useful tool for showing sequences of steps and decisions, do not inherently categorize activities by roles and do not provide a clear representation of responsibilities across different participants in the process. Business Process Model and Notation (BPMN), although comprehensive and standardized for business process modeling, can be more complex and detailed than what is needed for straightforward role and material flow representation. Thus, Swimlane Diagrams stand out for this specific purpose.