Project TND has been rigorously tested. More than 3,000 youth from 42 high schools in Southern California have participated in our research on the program. We have evaluated program effectiveness in alternative (continuation) high schools as well as regular high schools. The student populations in these schools have been ethnically diverse, including African American (5-26%), Latino/Hispanic (38-46%), Asian (1-7%) and white (36-45%) students.

To date, we have conducted three randomized experimental studies in which schools that received the program were compared to schools that did not receive the program. In the most recent study, we found that at one-year follow-up (i.e., one year following completion of the program), relative to comparison students, alternative high school students that received Project TND experienced:

A 27% prevalence reduction* in 30-day cigarette use;

A 22% prevalence reduction in 30-day marijuana use;

A 26% prevalence reduction in 30-day hard drug use;

A 9% prevalence reduction in 30-day alcohol use among baseline drinkers; and

A 25% prevalence reduction in one-year weapon carrying among males.

For a copy of an article summarizing the program evaluation research findings, click here.

Other research articles of interest are:

Long-term outcomes of Project TND (click here)

One-year outcomes of Project TND (click here)

Generalizability of Project TND (click here)

Development of Project TND(click here)

* NOTE: Prevalence reduction refers to no engagement in the behavior within the time period specified (i.e., 30 days or one year prior to the survey) among the students that received the program, compared to the control group (which did not receive the program).