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I am using a multiple baseline technique.
A pre-intervention reading fluency baseline is established for all three students (Bill, Gloria, and Bob). The data is usually collected concurrently across all three participants.
After three to five trials and assuming a stable baseline is established, Bill is introduced to the experimental condition, a reading fluency program. The program is introduced while the other two subjects continue with the baseline condition.
After three to five more trials, Gloria goes into the experimental phase. The third student, Bob, continues with the baseline condition.
After three to five more days, Bob starts the experimental phase while the other two participants continue in the intervention phase.
In this example, the dependent variable is the number of words read correctly during a one-minute time period, and the independent variable is the three students. This design allows the teacher to know that the intervention is effective for Bill and Gloria but is not working for Bob.
Alternating Treatment Design
The alternating treatment design is used to compare the effects of two treatments on one subject. Two interventions or practices are introduced and alternated at each of the training sessions. The teacher determines randomly which of the two experimental interventions to select for each session. This design offers the teacher a method for comparison of the two interventions is better suited to improving the student’s performance.
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Dec 20th, 2015
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