Behavioral triggers translate raw shopper activity into meaningful signal. Time on page, scroll depth, repeated visits to the same product, adding and removing an item from the cart, and comparing two similar products are all measurable actions that correlate with a specific psychological state: uncertainty. A well-designed trigger system does not fire on every signal — it fires on combinations and thresholds that reliably indicate a shopper is stuck. A single trigger (like time on page alone) produces false positives; a shopper reading a long product description isn't necessarily uncertain. Combining signals — time on page plus a scroll pattern that suggests comparison, for example — produces a more reliable trigger.