“…However, if time series are long enough and if the required assumptions hold, then interrupted time series designs are among the strongest quasi-experimental designs. Nonetheless, time series designs in educational evaluations are rare and typically not long (Henry & Rubenstein, 2002;Kearney & Kim, 1990;Lin & Lawrenz, 1999;May & Supovitz, 2006;Moon, Stanley, & Shin, 2005).…”