| A | B |
|---|
| interrupted time series design | A group is measured at different times, with a treatment aplied at some point |
| order effect | Results of multiple measurements of individuals in different experimental conditions such that a particular behavior changes depending on which condition follows. |
| selection threat | Groups to be compared differ before being exposed to different experimental treatments. |
| attrition threat | When participants drop out of a study. |
| history threat | Some event outside the study affects participants systematically. |
| One-group pretest-posttest design | A single group is measured before a treatment is applied, then again afterward. |
| nonequivalent control group design | Two groups differ on some pre-existing dimension are measured on a pretest, exposed to a treatment, and measured on a posttest. |
| repeated-measures design | Another name for within-subject design |
| random assignment | Each participant has an equal probability of being assigned to each group. |
| within-subject design | Same participants serve in each of the different conditions. |
| between-subject design | Different groups of participants serve in different conditions. |
| symmetric transfer | A change in behavior that results from learning in an earlier condition, with the same degree of change in later behaviors, regardless of the order of conditions. |
| asymmetric transfer | A change in behavior that results from learning in an earlier condition, with differences in the amount of transfer in later condition depending on which conditions occur first. |
| baseline | A series of measurements recorded before a treatment is applied to see the normal course of behavior prior to an intervention. |
| Counterbalancing | Changing the order of conditions. |
