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The Science Behind the PSTI®

Backed by peer-reviewed research, validated through psychometric testing, and trusted by individuals, teams, and organisations worldwide.

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Peer-reviewed
Validated by independent researchers and published in academic outlets

Psychometrically sound
Reliable, evidence-based measure of public speaking anxiety triggers.

Data-driven insights
Built on 1,000+ completions with on going analysis and benchmarking

Widely applicable
Used by students, professionals, leaders, coaches, and trainers

Scientific validation

The Public Speaking Threats Inventory® (PSTI®) was developed through rigorous academic research led by Dr. Alexander McWilliam and colleagues, with findings published in the peer-reviewed journal Personality and Individual Differences.

  • Validated with a UK sample of over 1,000 adults
  • Robust factor structure confirmed through EFA and CFA
  • 27 items across 3 distinct psychological domains: physiological arousal, self-perceptions, and external judgements
  • Excellent reliability (α = .89 total scale; .78–.87 domain scales)

Designed for both individuals and organisations, the PSTI® delivers clear, actionable insights in under 10 minutes—making it a practical tool for personal development, coaching, team training, and leadership growth.

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Why it matters

63% of people fear public speaking. For those who are socially anxious, that fear rises to 97%. Not only is it extremely uncomfortable, but it can also hinder our ability to focus, and reduce overall performance in meetings, pitches, classrooms, and beyond.

The PSTI® helps you pinpoint which aspects of public speaking feel most threatening, allowing for interventions to be tailored to improve efficacy

Whether you’re building personal confidence or supporting others, the PSTI® provides actionable insights that foster targeted development — not guesswork.

Backed by science. Built for you.

Pinpoint your triggers and take control with the PSTI®.

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