Certification that contractor is not debarred. 3. This checklist is provided as a convenience to bidders in areas where past experience indicates such instruction can be helpful.Use of this checklist may help ensure that your submission is complete. Place a check mark in the "Done" column as you complete and enclose each item. Required. This checklist is provided to assist each Proposer in the preparation of their proposal response. Form 1: Response Checklist. Form 2: Proposal Information Form.