| Baseline design | A single-subject experimental design in which subjects are observed under each of several treatment conditions. Observations made during baseline periods (no treatment) are compared with observations made during intervention periods (treatment introduced).
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| Behavioral baseline | Level of behavior under the baseline and intervention phases of a single-subject, baseline design. It is used to determine he amount of uncontrolled variability in the data.
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| Stability criterion | Criterion used to establish when a baseline in a single-subject, aseline design no longer shows any systematic trends. Once the criterion is reached, the subject is placed in the next phase of the experiment.
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| Baseline phase | Phase of a single-subject, basline design in which you establish the level of performance on the dependent measure before introducing the treatment.
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| Intervention phase | Phase of a single-subject, baseline design in which the treatment is introduced and the dependent measure evaluated.
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| ABAB design | In a single-subject baseline design, the baseline (A) and intervention (B) phases are each repeated to provide an immediate intrasubject replication.
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| Intrasubject replication | In a single-subject experiment, each treatment is repeated at least once for each subject and behavior is measured. This helps establish the reliability of the results obtained from a single-subject experiment.
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| Reversal strategy | Running a second baseline phase after the intervention phase in a single-subject, baseline design.
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| Intersubject replication | The behaviors of multiple subjects used in a single-subject design are compared to establish the reliability of results.
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| Systematic replications | Conducting a replication of an experiment while adding new variables for investigation.
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| Direct replications | Exactly replicating an experiment. No new variables are included in the replication.
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| Multiple-baseline design | Simultaneously sampling several behaviors in a single-subject, baseline design to provide multiple baselines of behavior. Used if your independent variable produces irreversible changes in the dependent variable.
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| Dynamic design | An experimental design in which the independent variable is varied continuously over time while monitoring the response of the dependent variable.
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| Discrete trials design | A single-subject experimental design in which subjects receive each treatment condition dozens or hundreds of times. Each trial (exposure to a treatment) produces one data point, and data points are averaged across trials to provide stable estimates of behavior.
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