Discussion
The basic single subject design in intervention research is known as ..............
Answer: D
The basic single subject design is the AB design.
In single subject (single system) research, A stands for the baseline phase, in which the target behaviour is measured repeatedly before any intervention, and B for the intervention phase, in which measurement continues while the intervention is applied. Comparing the two phases shows whether change followed the intervention.
The ABC design adds a second, different intervention (C) and so is an extension of the basic design. 'AAA' and 'A' designs have no intervention phase at all, so they could not test an intervention.
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