Discussion
To ascertain the effectiveness of social work intervention we prefer to use :
Answer: B
The preferred design is the single subject research design.
Single subject (single system) designs measure a client's target problem repeatedly during a baseline phase (A) and then during the intervention phase (B), as in AB, ABA or multiple-baseline designs. Because they can be built into everyday practice with one client, family or group, social work research texts recommend them for evaluating the effectiveness of one's own interventions.
Descriptive and exploratory designs describe or explore a situation and do not test whether an intervention worked. Group experimental designs can test effectiveness, but they need control groups and random assignment that are rarely practical for a worker evaluating his or her own practice.
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