方法对比

	Single-Case Experimental Design	Changing Criterion Design
领域	Disability Studies	Disability Studies
方法族	Process / pipeline	Process / pipeline
起源年份	2013	2013
提出者	Thomas R. Kratochwill and the What Works Clearinghouse single-case design panel	Single-case methodology tradition; design standards by Kratochwill et al.
类型	Within-subject experimental pipeline for evaluating interventions on individuals	Within-subject experimental pipeline for shaping behavior toward a goal in graded steps
开创性文献	Kratochwill, T. R., Hitchcock, J. H., Horner, R. H., Levin, J. R., Odom, S. L., Rindskopf, D. M., & Shadish, W. R. (2013). Single-case intervention research design standards. Remedial and Special Education, 34(1), 26-38.	Kratochwill, T. R., Hitchcock, J. H., Horner, R. H., Levin, J. R., Odom, S. L., Rindskopf, D. M., & Shadish, W. R. (2013). Single-case intervention research design standards. Remedial and Special Education, 34(1), 26-38.
别名	Single-Subject Experimental Design, N-of-1 Experimental Design, Single-Case Research Design, SCED	Changing-Criterion Single-Case Design, Stepwise Criterion Design, Shaping-Verification Design, CCD
相关	3	3
摘要	Single-case experimental design (SCED) is a family of rigorous within-subject experimental methodologies for evaluating whether an intervention causes change in an individual, widely used in rehabilitation, special education, and applied behavior analysis. Rather than averaging across a large sample, SCED measures a defined target behavior repeatedly across a baseline (A) phase and an intervention (B) phase, and infers a causal effect when the change is replicated at three or more different points in time within the same case. Internal validity is built into the design itself through systematic manipulation of the independent variable and repeated demonstrations of effect, not through a control group. The 2013 What Works Clearinghouse single-case design standards, formalized by Kratochwill and colleagues, codified what counts as a credible SCED, including requirements for systematic manipulation, at least three attempts to demonstrate an effect, and minimum data points per phase. SCED is the experimental backbone of evidence-based practice for individuals whose conditions, contexts, or low incidence make group designs impractical.	The changing criterion design (CCD) is a single-case experimental method in which a behavior is gradually shaped toward a terminal goal through a series of stepwise performance criteria. Instead of expecting a behavior to leap from baseline to its final target, the analyst sets an initial subgoal, reinforces performance that meets it, and then ratchets the criterion up (or down) once behavior stabilizes at each step. Experimental control is demonstrated when the behavior repeatedly and closely tracks each successive criterion change — changing only when, and to the degree that, the criterion changes — so that each new step functions as another demonstration of effect. The design is especially well suited to behaviors that should change incrementally, such as increasing exercise tolerance, reducing cigarettes smoked, or building a new skill in graded approximations. It belongs to the single-case design family codified by Kratochwill and colleagues in 2013, sharing their requirements for systematic manipulation and replicated demonstrations of effect.