Interviews are self-reports that occur as part of a live interpersonal interaction. Types include focus groups, narrative interviews, semi-structured interviews, and structured interviews. Interview data are analyzed through coding. The strength of interview measures is the potential depth and nuance of the data; the limitation is the potential for interviewer bias. Questionnaires are self-reports made by self-administered paper or online reporting. Strengths include the standardization which produces known indicators of reliability and validity; limitations include the potential for poorly written questions and the potential for recall bias and social desirability. Finally, HDFS uses forms of self-report that involve some kind of task, such as daily diary, demonstration tasks, story completion, and the use of vignettes. Examples in HDFS are provided. Self-report works best for subjective variables, but is frequently used for other things as well.