Many jurisdictions publish guides and other resources on workplace violence that provide useful information on conducting violence risk assessments. Here are links to some of them:
FED: Guide to Violence Prevention in the Work Place
AB: Preventing Violence and Harassment at the Workplace
BC: A Workbook for Employers and Workers: Preventing Violence
MB: Guideline for Preventing Violence and Harassment in the Workplace
NS: Reference Guide to the Violence in the Workplace Regulations; Assessing the Risk of Workplace Violence
ON: Workplace Violence and Harassment: Understanding the Law; Developing Workplace Violence and Harassment Policies: What Employers Need to Know; Developing Workplace Violence and Harassment Policies: a Toolbox
PE: Guide to the OHS Regulations on Prevention of Workplace Violence
SK: Violence: a Guide to Developing a Violence Policy Statement