A Researcher Is Planning to Use an ABAB Single Systems

Multiple Choice

A researcher is planning to use an ABAB single systems design to evaluate a program that serves adolescents. More specifically, the researcher is interested to see if the program helps reduce amounts of anxiety after 30 days. What do the A and B phases stand for in a single systems design?

A) A = Intervention phase; B = Outcome phase
B) A = Baseline phase; B = Outcome phase
C) A = Intervention point; B = Baseline point
D) A = Baseline phase; B = Intervention phase