At least the supplier to be selected; It must have ISO 9001 certificate. IATF 16949: 2016 standard explained the supplier selection criterion in article 188.8.131.52 as follows.
The selection process shall include:
an assessment of the selected supplier's risk to product conformity and uninterrupted supply of the organization's product to its customers;
relevant quality and delivery performance;
an evaluation of the supplier's quality management system;
multidisciplinary decision making;
an assessment of software development capabilities, if applicable.
Apart from these criteria, the volume of the automotive business, financial stability, purchased product, material, or service complexity, required technology, adequacy of available resources, design, and development capabilities. Manufacturing capability, change management process, business continuity planning, logistics process, customer service, topics can also be added.