Management system standards have always included a series of common requirements – like the need for a documentation, policy, objectives, internal audits, management reviews, identification and treatment of nonconformities using corrective and preventive actions, among others.
Those common elements were served as a basis for the integration but, different terminology, structure and requirements made this effort difficult in many cases.
In response to this problem ISO has developed the Annex SL that defines the structure to be used by all management system standards published by the International Standardization Organization (ISO). The structure is applicable to ISO standards, but also to PAS (Publicly Available Specifications) and TS (Technical Specifications). The new versions of ISO 9001 or ISO 14001 follow this structure, just as ISO/IEC 27001 or ISO 22301.
At the same time, to support organizations in the integration effort another document has been published by the BSI (British Standards Institution), called PAS 99. It serves as a guide for the integration of two or more management system standards.