The use of home-based treatment programs has become increasingly popular over the last few years. Such a program is offered by the Youth Services Bureau of Ottawa-Carleton through its Detached Worker Program. This program uses paraprofessionals who employ an eclectic combination of behavioral, client-centered, family and reality therapies. Two distinct studies were conducted to evaluate the effectiveness of the Detached Worker Program. The first one evaluated overall effectiveness of the intervention. Subjects included clients in treatment (N=18) and clients on the waiting list (N=42). Results demonstrated overall effectiveness by a lower number of police contacts and other counseling contacts for those in treatment. Questions arose about the factors that contribute to effectiveness. The second study evaluated these factors using client and worker variables as predictors in a multiple regression analysis. Subjects (N=126) were clients from a 2-year period with an average treatment length of 8.7 months. Treatment length was found to be the most important variable, followed by treatment model, and who provided supervision. Results imply that home-based programs can be readily evaluated and that treatment should be intensive and long-term to get maximum effect. (ABL)