You are conducting a third-party Stage 1 audit at ABC Ltd, a single-site organisation that...

According to ISO 9001:2015, clause 8.4, an organization is required to control the processes, products and services provided by external providers, including those that affect the quality of the organization’s own products and services. This includes determining the controls to be applied to the external provision of processes, products and services, as well as the information to be communicated to the external providers. The organization is also required to monitor, measure, and evaluate the performance of the external providers and retain documented information of these activities.

Therefore, in the scenario given, ABC Ltd is responsible for controlling the processes, products and services provided by Teak Ltd, as they affect the quality of ABC Ltd’s own products and services. This means that ABC Ltd should have established criteria and methods for evaluating the performance of Teak Ltd, as well as documented information of the results of such evaluation. ABC Ltd should also have defined the supply arrangements with Teak Ltd, including the specifications, requirements, and verification activities related to the products and services provided by Teak Ltd.

Hence, the best options to describe how to plan the audit of the interrelationship with Teak Ltd during the Stage 2 audit at ABC Ltd are A and D, as they are aligned with the requirements of ISO 9001:2015, clause 8.4. The other options are either irrelevant or beyond the scope of the audit, as they do not pertain to the control of external provision by ABC Ltd.