The Human Analytics team is pleased to offer an updated briefing paper comparing and contrasting standards for the provision of private security services. This is the second edition of the briefing paper, “Standards for Private Security Services,” and it contains additional information related to the recently released ISO 18788: 2015 Management System for Private Security Company Operations. The paper also examines three other standards – the Voluntary Principles on Security and Human Rights, the International Code of Conduct for Private Security Service Providers, and ANSI/ASIS PSC.1-2010 Management System for Quality of Private Security Company Operations. Among the issues discussed are the origins of the standards, their relationship to each other, implementation efforts, and recent developments. A chart compares all four standards in terms of their content, scope, assurance mechanisms, and governance. The briefing paper can be downloaded for free here, and is a useful resource for understanding the evolving standards landscape for private security services.