What is a primary characteristic of a single subject ABA design?

The primary characteristic of a single subject ABA design is that it examines one subject's behaviors over time. This type of research design emphasizes the study of individual behavior change in response to interventions. It involves repeated measurements of the same behavior before, during, and after the implementation of an intervention, allowing for an in-depth understanding of how the treatment affects that particular individual.

This approach is particularly valuable in applied settings, such as music therapy, where the focus is on tailored interventions that address the unique needs of each client. Thanks to this design, practitioners can observe variations in behavior that might not be evident in larger group studies. By analyzing data from a single subject, therapists can make more informed decisions about ongoing treatment and modifications necessary for effective intervention.

In contrast, the other choices involve multiple subjects or pairs for control, which is not the focus of single subject design.