A vendor developed a new payroll system for a local transit authority. Due to the system's complexity, the vendor will need to work with the transit authority for three months after system…

A warranty covers defects in a delivered product and guarantees it performs to specification, but does not define the collaborative working relationship or ongoing support activities described.

A training plan documents how end users will be trained on the system and does not address post-implementation vendor support obligations or timelines.

A WBS (Work Breakdown Structure) decomposes project deliverables into manageable components during planning and does not document post-project service commitments.

An SLA (Service Level Agreement) is a contract between a service provider and a customer that specifies the nature, quality, availability, and scope of the service to be delivered after implementation. The three-month post-implementation support period described - including how the vendor will work with the transit authority - is precisely what an SLA codifies. It defines response times, support obligations, and the conditions under which service is provided during that period.