This research evaluated a draft preference assessment tool (draft-PAT) designed to replace the current Customary Routine section of the Minimum Data Set (MDS) for nursing homes. The draft-PAT was tested with a sample of nursing home residents to evaluate survey-level administration time and noncompletion rates, as well as item-level nonresponse rates, response distributions, and test-retest reliability. Modifications to the draft-PAT were then retested with a subsample of residents. Completion times were brief (generally less than 10 minutes), and only a small percentage of residents were unable to complete the interview. Item-level nonresponse rates were low for the draft-PAT (0% to 8%) and even lower during retesting for items advanced to the national field trial (0% to 4%). Item response distributions indicated reasonable use of all options across both testing occasions, and item-level test-retest reliability was high. This study found that nursing home residents can reliably report their preferences. Eighteen items from the modified draft-PAT were advanced to the national field trial of the MDS 3.0. Inclusion of the PAT in the MDS revision underscores increased emphasis on including residents' voice in the assessment process.