One such method of evaluation is reliability. A reliable test is one that will provide the same results when repeated on multiple occasions (i.e. test-retest reliability), by different people (i.e. inter-rater reliability), or the same person (i.e. intra-rater reliability). An unreliable test yields widely varying results when repeated, which would make changes in a patient's test results difficult to interpret. In this study, test-retest reliability will be estimated using a single clinician (equivalent to intra-rater reliability) as it examines the degree to which a test is able to produce consistent results or whether it is dependent on the situation or the state of the individual being tested (Rousson, Gasser, & Seifert, 2002). In future studies, inter-rater reliability will be examined which is largely dependent on and concerned with adequate training of raters as opposed to the properties of the test itself.