Final answer:
The Contracting Officer (CO) is responsible for ensuring that evaluation plans are documented in the contract files.
Step-by-step explanation:
The responsibility for documenting evaluation plans (i.e. QASP) in contract files falls to the Contracting Officer (CO). The Contracting Officer is responsible for ensuring that all contractual requirements are properly documented and maintained. This includes the evaluation plans, which outline the criteria and methods for assessing the performance of the contractor.
The evaluation plans are an important component of the contract files, as they provide a roadmap for monitoring and evaluating the contractor's performance. They help to establish clear expectations and ensure that the contractor is meeting the agreed-upon standards. By documenting the evaluation plans in the contract files, the Contracting Officer can refer back to them throughout the contract period to assess performance and make informed decisions.