Random assignment is a process similar to a lottery, in which individuals are selected to participate in a program. All volunteers for BOND will be assigned to one of the three groups, and nothing about the volunteer as an individual will affect which group comes up. A computer program makes the assignments using random numbers. No one can control the outcome of random assignment for a specific volunteer. Random assignment is used to give every volunteer the same chance of getting into the program and to create comparable groups for the research that will determine whether BOND is effective.