• the court system makes a ruling on a case
• legislators amend an old policy or pass a new policy

Which is a good title for the examples in the box above?

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.