What setting must be enabled for process variable(s) to provide data when a process starts?

The setting that must be enabled for process variables to provide data when a process starts is the parameter setting. In Appian, when you design a process model, parameters allow you to define input variables that can be passed into the process when it is initiated. These parameters are crucial for ensuring that necessary data is available at the start of a process, enabling it to execute its tasks effectively based on the provided input.

By utilizing parameters, you can ensure that the process has access to the required information, allowing for a seamless flow of data from the process initiation point. This design element is essential for building dynamic and responsive processes that can adapt based on the data supplied when they are triggered.

The other settings mentioned, while important in their respective contexts, do not directly address the requirement for process variables to be populated at the initiation stage. For example, initialization refers more to the setup phase of the process, input mapping is related to mapping the data between different parts of a process (like how data flows into a task), and data connectors facilitate connections to external data sources but do not inherently define how initial data is provided when a process begins.