Purpose/Hypothesis: Minimal data are available on psychometric properties of physical performance measures used with individuals with low bone mass and osteoporosis. Data are needed before these measures can be used with patients. The purpose of this methodological study was to determine rater reliability of clinical measures with healthy individuals and to develop a safe, standard protocol for patients. Number of Subjects: Participants: Convenient sample (n=14; 11 women) of healthy volunteers (M = 38; SD = 12 yrs).Testers: 2 PhD student testers and data analyzers; 1 blind reader and data entry. Materials/Methods: Instruments: Stadiometer, scale, hand and hand-held dynamometers, trunk strength tester, force plate. Procedures: Repeated testing of height, weight; lower extremity, trunk extensor and grip strength; sitting and standing balance. Data analysis: ICCs and coefficients of variation. Participants' feedback collected for qualitative analysis. Results: Excellent intra-rater reliability of height (ICC(2, 1) = .99) and weight (ICC(2, 1) = 1.00); good to excellent intra- and inter-rater reliability in all strength tests except hip extension (ICC(2, 2) = .74), hip abduction (ICC(2, 2) = .61), knee flexion (ICC(2, 2) = .58); excellent to good reliability of sitting and standing balance except standing forward reach/hold task (ICC(2, 3) = .66) and single leg stance (ICC(2, 3) = .50). Participants made safety and comfort suggestions. Conclusions: Intra-rater reliability acceptable; inter-rater reliability acceptable except for selected strength and balance testing. Clinical Relevance: Results of this pilot will be used to develop and assess the protocol for testing patients with low bone mass referred to Drexel's Osteoporosis Education and Exercise Program.