Which type of model outlines the sequential flow of control among system components?

The correct choice identifies a system process model as the type of model that outlines the sequential flow of control among system components. This model focuses on the interactions and control flow between various parts of a system, detailing how processes are initiated and how they move through different stages or components.

In a system process model, elements such as inputs, outputs, and operations are clearly defined, allowing stakeholders to understand how data flows and how processes are executed over time. This is crucial for ensuring that the system functions as intended and that all components work harmoniously to achieve the desired outcomes.

Other options, such as a user interface model or a behavior model, do not primarily emphasize the sequential flow of control among system components. A user interface model focuses on the interaction between users and the system, while a behavior model describes the dynamic interactions and responses of the system, often from a user's perspective rather than the component flow. Although a flowchart model might also depict sequences, it is typically used for specific operations or algorithms rather than providing a holistic view of a system's components and their interactions. Therefore, the system process model is specifically designed to capture the sequential flow, making it the most fitting choice for this question.