David Trembath, PhD
Griffith Health Institute, Griffith University
Olga Tennison Autism Research Centre, La Trobe University
Now that we have implemented intervention in a staggered fashion, we are ready to look for changes.
We can use both visual analysis and statistical methods as discussed earlier.
We are looking for a pattern whereby behaviours only change when intervention is introduced (as illustrated).
If both behaviours change following the introduction of intervention for only the first behaviour, than:
- They are too closely related.
- Another factor (e.g., maturation) most likely led to the change.
Look back to the five possible factors you identified in the previous exercise in light of the information presented in Module 17.
Now, imagine that you have collected multiple baseline data, and have shown that both behaviours increased over time, but that you failed to demonstrate experimental control (because the second behaviour increased while still in baseline). Taking into account the information across the modules, and using your clinical experience, identify three things that you would do differently next time to help ensure that you are able to demonstrate experimental control.