The Human Systems Integration Program Plan (HSIPP) describes the contractor's Human Systems Integration (HSI) program; its elements to support requirements and activities for HSI specified in the contract; and how they will be managed and integrated with other program elements. It does not take the place of related plans such as the System Safety Plan; Training Plan; Programmatic Environment, Safety, & Occupational Health Evaluation; Human Engineering Program Plan (HEPP); or an HSI section in the Systems Engineering Management Plan, unless the procuring agency so directs.