Interruptions have negative effects on the task performance in modern work environments. These negative effects are not affordable in tasks in which decisions are time-critical and life-critical in nature. Human- supervisory control (HSC) tasks in time-critical settings such as mission command and control and emergency response are especially vulnerable to the negative effects of interruptions since supervisors in such settings are prone to frequent interruptions which are valuable source of information and hence cannot be ignored. Consequences of a wrong decision in these settings is extremely costly due to their life-critical nature. This book investigates a interruption-recovery tool to assist supervisors in time-critical work environments. The methodology provides insight in studying interruption recovery in similar settings.