ISO/PAS 20858:2004建立了一个框架，以协助海港设施指定人员进行海港设施安全评估的能力，并根据ISPS规范的要求制定安全计划，进行海港设施安全评估，以及起草港口设施安全计划（PFSP）。 此外，ISO/PAS 20858:2004规定了某些文件要求，旨在确保执行上述职责所用的过程以允许合格授权机构进行独立验证的方式进行记录（如果港口设施同意审查）。

ISO/PAS 20858:2004 establishes a framework to assist marine port facilities in specifying the competence of personnel to conduct a marine port facility security assessment and developing a security plan as required by the ISPS Code, conducting the marine port facility security assessment, and drafting a Port Facility Security Plan (PFSP). In addition, ISO/PAS 20858:2004 establishes certain documentation requirements designed to ensure that the process used in performing the duties described above was recorded in a manner that would permit independent verification by a qualified and authorized agency (if the port facility has agreed to the review).