Describe the similarities and differences between time-series and interrupted time-series designs

What will be an ideal response?

Both time-series designs require a series of observations for each participant before and after a treatment or event. Both designs are quasi-experimental designs. In the time-series design, the event that occurs in the middle of the series of observations is actually a treatment manipulated or administered by the researcher. In contrast, in the interrupted time-series design, the researcher does not manipulate the intervening event. This design can be used to evaluate the influence of outside events such as natural disasters.