方法对比

	Single-System Design	ABAB设计
领域	Social Work	实验设计
方法族	Process / pipeline	Process / pipeline
起源年份	2009	1960s (Sidman 1960; Baer et al. 1968)
提出者	Martin Bloom, Joel Fischer & John G. Orme (codification in social work)	Murray Sidman; Baer, Wolf & Risley (applied behavior analysis formalization)
类型	Time-series design for evaluating intervention with a single client system	Single-subject experimental design
开创性文献	Bloom, M., Fischer, J., & Orme, J. G. (2009). Evaluating Practice: Guidelines for the Accountable Professional (6th ed.). Pearson/Allyn & Bacon. ISBN: 9780205458066	Sidman, M. (1960). Tactics of Scientific Research: Evaluating Experimental Data in Psychology. Basic Books.
别名	Single-Subject Design, Single-Case Design, N-of-1 Design, Single-System Evaluation	reversal design, withdrawal design, ABAB reversal, operant reversal design
相关	4	6
摘要	A single-system design is a time-series approach to evaluating practice in which a single client system — an individual, family, group, or organization — is measured repeatedly on a clearly defined target before and during (and sometimes after) an intervention. By tracking the same system over time rather than comparing a treatment group to a control group, it lets a practitioner judge whether their own intervention is associated with change in the people they actually serve. It is the methodological backbone of the 'accountable professional' tradition codified by Bloom, Fischer, and Orme.	The ABAB design is a single-subject experimental methodology that establishes causal control by repeatedly introducing and removing an intervention. A baseline phase (A) is followed by an intervention phase (B), then a return to baseline (A), and a second intervention phase (B), allowing the researcher to demonstrate that observed behavior changes are produced by the intervention rather than by coincidental factors.