Which component is not included in the four basic components of WHMIS?

The four basic components of the Workplace Hazardous Materials Information System (WHMIS) include governing legislation, employee training, labels on hazardous materials, and Material Safety Data Sheets (MSDS).

In this context, vendor certification is not part of these fundamental components. Instead, vendor certification typically pertains to a process that confirms a supplier's ability to provide quality materials based on specific standards. While vendor certifications might ensure the safety and compliance of materials being used, they do not directly contribute to the WHMIS framework itself.

The governing legislation ensures regulatory compliance for hazardous materials; employee training is essential to educate workers on handling these materials safely; and Material Safety Data Sheets provide detailed information about the hazards, safe handling, and emergency measures related to specific substances. These elements work together to create a comprehensive safety system in the workplace, which is why vendor certification is not considered part of the core WHMIS framework.