<qa>  What is the most common method of self-report?The easiest methods employ questionnaires, interviews or written documentation ie diaries. These can be supplemented by a pill identification test. This test asks the patients to examine a board displaying two similar pills for each antiretroviral drug and to identify which they have been taking. Correct scores on the test have been shown to correlate with adherence. The accuracy of self reported adherence depends on the patients ability to recall and accurately report this behavior. Since patients may have difficulty in recalling their adherence over longer periods of time, one commonly used measure relies on self-report over each of the past 4 days. All methods of self-report overestimate the level of adherence compared with treatment adherence measures. Patients wish to please their health care provider may be partially responsible for this. Patients who admit being non-adherent by self-report also have poor adherence on other measures. 