When you add Conditional Starts to a Process you should consider well the business case you are addressing, or else you may be introducing unnecessary complexity to the deployment of applications. This is essentially due to:
Each conditional start has its own life cycle and it keeps an activity instance permanently active and listening to events. On each event, a new execution of the flow is launched, meaning that, multiple events launch multiple executions growing the amount of information. When deploying an application, the impact analysis goes over all this information;
During the deployment of applications, a specific validation is ran for conditional starts. It goes over all instances of active processes and checks whether each conditional start in the process has an activity instance listening to its event. Any missing activity instance is created. This operation brings an extra overhead to the deployment.
In this case, we recommend that you do one of the following:
Think of a process to handle candidates that apply for a job. At some point, interviews are scheduled and each scheduled interview is handled independently by a conditional start.
The conditional start is only necessary when interviews are scheduled, therefore, a dependency connector is added right before that activity.
Move the flow of the conditional start to a new process and replace all executions of the conditional start by executions of the new process.
Add an input parameter to the new process to pass the identifier of the main process. This way, the new process is automatically related with the main process, which is useful for reporting. To pass other values you need, simply add more input parameters.
From the process of the previous example, imagine it also has a conditional start to take note of ad hoc telephone calls.
The TelephoneNote conditional start is being explicitly started because it has no Start On. It is, in fact, a generic flow. It can be moved to a new process.
This way, there are less conditional starts. Furthermore, the new process for the telephone notes is so generic that will probably be reused.
To reduce the upgrade impact of deleting the flow of the conditional start, consider the recommendation explained in topic Impact of Deleting Activities from Process Flows.
Finally, validate situations in which the main process may be Terminated. In this case, all processes replacing conditional starts have also to be terminated to keep the same behavior of the conditional start. Consider implementing this logic using the ProcessTerminate Action.
Overview of Best Practices for Designing Processes | Overview of Designing Processes