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There is a systematic bias between self-reported and clinician observation. Professionals should be aware that information provided by patients and observation of activity assessed by clinicians could differ substantially, especially for upper extremity function. Implications for Rehabilitation There is a systematic bias between self-reported and clinician assessment of similar performance items in older adults. In general, older adults overestimate their physical function or clinicians underestimate older adults function. The bias between self-reported and clinician assessment for upper extremity function is larger than that for lower extremity function. The conclusions regarding agreement across upper extremity and lower extremity function scores are not different when using mountain plots graphs versus relying solely on the value of the ICCs. However, the graphs expand our understanding of the direction and magnitude of score differences. Professionals should be aware that information provided by patients and assessment by clinicians could differ substantially, especially for upper extremity function.