Biglan et al.(1996)studied whether store clerks in eight Oregon towns were willing to sell tobacco products to minors.They measured clerk behavior repeatedly over time,implemented a positive reinforcement intervention at different times in different towns,and usually found a drop in willingness to sell after implementing this intervention.What research methodology did they use?

Question

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The study used both a multiple baseline design and an interrupted time-series design. The multiple baseline design was used to measure clerk behavior repeatedly over time in different towns, while the interrupted time-series design was used to implement a positive reinforcement intervention at different times in different towns and observe the effect on willingness to sell tobacco products to minors.

Biglan Et Al