Operational Stress Index (OSI)

Patent-pending algorithm that uses wearable physiological sensors to objectively measure an individual user’s stress in real-time to improve training effectiveness and readiness

How It Works:

  • Non-invasive wearable sensors stream real-time raw physiological data, including blood volume pulse, electrodermal activity, temperature and movement data
  • Data is processed in real-time on a mobile device or within the wearable biosensor
  • Individual’s current stress level is compared to a previously established baseline
  • Stress level is visualized on a mobile application for after action review


Proven to be over 95% accurate in operational and clinical applications


USMC Infantry Small Unit Leader’s Course
OSI measurements were predictive of individual resilience to stress, including the impact stress had on physiological reactivity and performance.
Cognitive behavioral therapy (CBT) for PTSD
Patients who used the OSI were less likely to discontinue therapy and significantly improved on measures of stress, anxiety, and anger compared to patients undergoing standard CBT.

Military & Clinical Applications

OSI supports Warfighter readiness for the modern operational environment

  • Evaluate the utility of coping and decision making strategies
  • Adapt training content based on stress response
  • Personalize training based on individual and team stress responses
  • Provide after action performance feedback

  • Identify resilient individuals – those who perform best under stress
  • Determine those individuals least likely to develop stress disorders
  • Determine if a training system replicates the stress of the operational environment

Resilience Training

Stress mitigation techniques are provided to users in order to support resilience training, leveraging biofeedback that can be used in real-time during live training exercises and utilizing an alert to draw attention to increasing levels of stress. DI’s training solution also allows individuals to quickly recognize when and how decision making is impacted by stress and how best to adjust and recover.