Which component is essential for connecting different parts of a process model in Appian?

Gateways serve a crucial role in process modeling within Appian, as they are responsible for controlling the flow of a process by determining which path to take based on specified conditions. They enable the branching and merging of process paths, facilitating decisions that can direct the sequence of activities in a process. This capability allows for complex logic and the handling of multiple scenarios, ensuring that different parts of a process can interact effectively based on the outcomes of decision points.

The other components listed play important roles in a process model, but they do not specifically connect different parts of a process in the same way that gateways do. Sub-processes can encapsulate and manage a sequence of activities but are more focused on modularizing parts of a process rather than controlling the flow. Interfaces are used to interact with users, providing a front-end experience, and data stores pertain to where information is kept but are not involved in the flow decision-making within the process model. Thus, gateways are the essential components for connecting and directing the flow of activities in a process model.