Behavior modification refers to techniques used to increase or decrease specific behaviors. It relies on conditioning and is used by parents, therapists, and animal trainers. Therapists using behavior modification take an active role in thoroughly assessing issues, setting goals, and evaluating progress. Techniques include positive and negative reinforcement, extinction, flooding, and systematic desensitization. Applied behavior analysis, relationship development intervention, and verbal behavior therapy were used to treat a 3-year-old boy with autism, helping him develop communication, social, and self-care skills.