In Lifecycle Events, Activity Set Trigger Conditions determine when a specific phase of the employee journey begins. While many trigger conditions are simple (e.g., " Immediate " or " Date-based " ), selecting the Advanced option allows for highly complex logic. Upon selecting " Advanced, " the system reveals the Trigger script field, which provides a script editor for administrators to write custom JavaScript. This script must return a boolean true for the activity set to fire. This is particularly useful for enterprise-scale organizations with unique requirements that cannot be met by standard conditions-such as waiting for a specific value in an external integrated system or checking complex multi-table relationships before initiating the next set of onboarding or offboarding tasks.