An  Assurance System is a Management System aimed at ensuring enterprise compliance, resilience, and risk mitigation against both internal and external Policys and threats. It encompasses processes, Directives and technologies that work in concert to validate enterprise adherence to policy requirements, industry standards, and internal policies while simultaneously bolstering the enterprise's ability to withstand and adapt to various challenges and disruptions.
ensuring enterprise compliance and resilience against internal and external constraints:

a. Regulation constraints: they defined what is allowed and not allowed by the law (See  Regulation Article).

b. Internal policies and rules constraints: they defined what is allowed and not allowed by the enterprise (see Business Policy).

c. Operational constraints: they maintain operational capacities of the company (maintain ability to produce, maintain quality, ensure product development , ability to hire, to train, etc, see Business Rule).

d. Architectural constraints: they guide design decisions and shape the overall structure of a system (see  Architecture principle).

An  Assurance Instrument is a resource or course of actions used by an Assurance System to achieve its objectives.

For instance:

Actions plans are course of actions aimed at solving incidents.

Data Controls are mechanisms used to ensure data quality and data integrity

Privacy Representatives are used to identify national entities in charge of privacy.