Check and Schutt (2012) explained the baseline phase, in a single-subject research design, is the period in which the intervention to be evaluated is not offered to the subject. During the baseline phase, repeated baseline measurements are taken until a pattern emerges. A minimum of three measures are required in the baseline phase. The treatment phase represents the time period during which the intervention is implemented (Check & Schutt, 2012). Repeated measurements of the same dependent variable using the same measures are obtained during the treatment phase. The patterns and magnitude of the data points are compared to the data points in the baseline phase to determine if there was a change. Check and Schutt (2012) listed three questions to be considered about measurement to ensure validity of a single-subject research design. These three questions are: (a) what should be measured, (b) how it should be measured, and (c) who will do the measuring. The dependent variable in a single-subject research design is the issue that is the focus of intervention (Check & Schutt, 2012). Once the target of the intervention has been identified, the researcher must determine how the outcome will be operationalized. Considering who will collect the data