Kristine Kienlen. Review of the WAVR-21: a structured professional guide for the  workplace assessment of violence risk (2nd edition).  https://www.workplaceviolence911.com/docs/WAVRReviewFinalWPV911-313.pdf

The author prepared this review of the earlier versions of the WAVR-21 for a workplace violence prevention informational website: “As a forensic psychologist with threat  assessment expertise, I find that the WAVR-21 provides me with an instrument to anchor my risk assessment and to ensure that I have carefully considered the most significant  empirical risk factors in this specialized area of workplace violence. Utilizing the WAVR-21  keeps me mindful of how violence risk is dynamic or may change over time, depending on  a number of factors including personal losses or stressors, mental health, organizational  response, and even risk management interventions.” She also makes a salient, cautionary  point about the practice of threat assessment: “A limitation of the WAVR-21 and of  Structured Professional Judgment Instruments in general is that they cannot be used  alone to assess violence risk. Cases involving potential risk of violence are complex and  influenced by a number of behavioral, personal, situational, and organizational factors. In any given case, there may be unique factors that either escalate or diminish the risk of  violence. Professional judgment is always needed when using this kind of instrument to assess risk. While violence risk and human behavior can never be predicted with 100%  accuracy, the benefit of Structured Professional Judgment Instruments like the WAVR-21 is the consistent examination of pertinent risk factors for the particular type of violence and guidance in determining risk level.”