Intolerance of Uncertainty Test

The concept of intolerance of uncertainty emerged as psychologists sought to understand why some people experience the unknown as deeply threatening. In 2007, R. Nicholas Carleton, M. A. P. J. Norton, and G. J. G. Asmundson developed the Intolerance of Uncertainty Scale (IUS-12) as an efficient tool to measure this construct. By condensing earlier measures, the researchers created a reliable scale that captures how individuals react to ambiguous situations. Rather than measuring a clinical disorder, the IUS-12 maps a cognitive bias: the tendency to believe that unexpected events are inherently negative and should be avoided.

This test profiles your response to the unknown across two subscales. The first facet, Prospective Anxiety, represents the active, apprehensive side of the construct. It captures the mental effort spent trying to anticipate and prevent unexpected events. If you score high here, you might find that unforeseen events upset you greatly, or that you feel frustrated when you lack information. You likely believe that you should always look ahead to avoid surprises, spending significant energy trying to plan for every possible outcome in an effort to keep the future predictable.

The second facet, Inhibitory Anxiety, represents the passive, freezing response to the unknown. It measures how uncertainty interferes with your ability to act in daily life. When facing an unpredictable situation, high inhibitory anxiety can make you feel paralyzed, preventing you from making decisions. You might feel that uncertainty keeps you from living a full life, or that you cannot function well when you do not know what will happen next. While prospective anxiety drives you to plan, inhibitory anxiety is what holds you back when plans are not enough.

Research using the IUS-12 has shown that intolerance of uncertainty plays a central role in how we experience stress. Studies suggest that individuals who struggle to tolerate the unknown are more vulnerable to worry and anxiety. Because the future is inherently unpredictable, trying to eliminate all uncertainty is an impossible task, often leading to a cycle of vigilance and exhaustion. Conversely, learning to accept ambiguity is linked to greater psychological flexibility and improved emotional well-being. Understanding where you fall can help you recognize when your desire for certainty is working against you.

Alongside your results, the chart displays population comparison markers to help you put your scores into context. These markers are estimated values rescaled from published research samples using the original IUS-12, rather than validated percentile norms for this specific online test. They serve as a general point of reference, showing where typical adult responses tend to cluster, rather than a precise ranking of your personal traits. Because individual responses vary widely based on life circumstances, these markers should be interpreted as a helpful guide rather than an absolute standard.

This test is provided for educational and entertainment purposes only. It is not a diagnostic instrument and cannot be used to diagnose any psychological condition. The test is based on the Intolerance of Uncertainty Scale (IUS-12) but uses its own items and is not affiliated with Carleton, Norton, Asmundson, or their institutions. If you find that anxiety or a need for control is causing significant distress in your daily life, please consider consulting a qualified mental health professional who can offer personalized guidance.

References

• Carleton, R. N., Norton, M. P. J., & Asmundson, G. J. (2007). Fearing the unknown: A short version of the Intolerance of Uncertainty Scale. Journal of Anxiety Disorders, 21(1), 105-117.