Nuisance alarms are common in alarm systems. High quantities of these alarms can significantly reduce the effectiveness of the alarm system and render it useless for providing timely notifications of process situations that demand operator attention. Nuisance alarms can result in incidents, lost production, environmental excursions or even serious accidents. Solving the nuisance alarm problem is an important and easy step in alarm system improvement. The seven-step approach from Hexagon to alarm system improvement is a well-known and proven methodology based on hundreds of successful projects and many terabytes of real-world data.